chore: Update discovery artifacts (#1438)

## Deleted keys were detected in the following stable discovery artifacts:
youtube v3 https://github.com/googleapis/google-api-python-client/commit/ec21dff96d9538ad6c7f9b318eca88178533aa95

## Deleted keys were detected in the following pre-stable discovery artifacts:
firebasehosting v1beta1 https://github.com/googleapis/google-api-python-client/commit/c83ac386b65f82e7ba29851d56b496b09a29cf98

## Discovery Artifact Change Summary:
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/96675a8d9158ec13353fe241f858201fc51b784d
feat(composer): update the api https://github.com/googleapis/google-api-python-client/commit/add2fbdc3afb6696537eb087bc1d79df9194a37a
feat(container): update the api https://github.com/googleapis/google-api-python-client/commit/f8fae98db6d1943411b1a6c0f5a65dea336569f6
feat(content): update the api https://github.com/googleapis/google-api-python-client/commit/0814e009a4a11800db5b4afd7b6260e504c98047
feat(datacatalog): update the api https://github.com/googleapis/google-api-python-client/commit/99706059e58bb3d616253a1af2cd162b5a0b0279
feat(dataflow): update the api https://github.com/googleapis/google-api-python-client/commit/d5f09ef30392532bcfdd82901148bdd3ac6eec01
feat(docs): update the api https://github.com/googleapis/google-api-python-client/commit/dc66f4cafba86baff6149b2f6e59ae1888006911
feat(file): update the api https://github.com/googleapis/google-api-python-client/commit/523fc5c900f53489d56400deb650f6586c9681a0
feat(firebasehosting): update the api https://github.com/googleapis/google-api-python-client/commit/c83ac386b65f82e7ba29851d56b496b09a29cf98
feat(healthcare): update the api https://github.com/googleapis/google-api-python-client/commit/a407471b14349b8c08018196041568f2a35f8d4f
feat(ideahub): update the api https://github.com/googleapis/google-api-python-client/commit/c6b0d83940f238b1330896240492e8db397dcd15
fix(keep): update the api https://github.com/googleapis/google-api-python-client/commit/08fee732e96d3220e624c8fca7b8a9b0c0bcb146
feat(managedidentities): update the api https://github.com/googleapis/google-api-python-client/commit/863b333da7848029fd1614fd48b46cfbe12afcd5
feat(memcache): update the api https://github.com/googleapis/google-api-python-client/commit/17dc001e4649f54944066ce153e3c552c850a146
feat(metastore): update the api https://github.com/googleapis/google-api-python-client/commit/f3a76c9359babc48cc0b76ce7e3be0711ba028ae
feat(slides): update the api https://github.com/googleapis/google-api-python-client/commit/314d61b9ef8c5c30f9756462504dc0df92284cb2
feat(sqladmin): update the api https://github.com/googleapis/google-api-python-client/commit/62784e0b1b5752b480afe1ddd77dcf412bb35dbb
feat(tpu): update the api https://github.com/googleapis/google-api-python-client/commit/16bf712cca4a393d96e4135de3d02e5005051b6d
feat(youtube): update the api https://github.com/googleapis/google-api-python-client/commit/ec21dff96d9538ad6c7f9b318eca88178533aa95
diff --git a/docs/dyn/sqladmin_v1beta4.instances.html b/docs/dyn/sqladmin_v1beta4.instances.html
index cb13f5d..051036d 100644
--- a/docs/dyn/sqladmin_v1beta4.instances.html
+++ b/docs/dyn/sqladmin_v1beta4.instances.html
@@ -250,7 +250,7 @@
     "destinationInstanceName": "A String", # Name of the Cloud SQL instance to be created as a clone.
     "kind": "A String", # This is always *sql#cloneContext*.
     "pitrTimestampMs": "A String", # Reserved for future use.
-    "pointInTime": "A String", # Reserved for future use.
+    "pointInTime": "A String", # Timestamp, if specified, identifies the time to which the source instance is cloned.
   },
 }
 
@@ -829,6 +829,7 @@
   "scheduledMaintenance": { # Any scheduled maintenancce for this instance. # The start time of any upcoming scheduled maintenance for this instance.
     "canDefer": True or False,
     "canReschedule": True or False, # If the scheduled maintenance can be rescheduled.
+    "scheduleDeadlineTime": "A String", # Maintenance cannot be rescheduled to start beyond this deadline.
     "startTime": "A String", # The start time of any upcoming scheduled maintenance for this instance.
   },
   "secondaryGceZone": "A String", # The Compute Engine zone that the failover instance is currently serving from for a regional instance. This value could be different from the zone that was specified when the instance was created if the instance has failed over to its secondary/failover zone. Reserved for future use.
@@ -864,7 +865,7 @@
       "enabled": True or False, # Whether this configuration is enabled.
       "kind": "A String", # This is always *sql#backupConfiguration*.
       "location": "A String", # Location of the backup
-      "pointInTimeRecoveryEnabled": True or False, # Reserved for future use.
+      "pointInTimeRecoveryEnabled": True or False, # (Postgres only) Whether point in time recovery is enabled.
       "replicationLogArchivingEnabled": True or False, # Reserved for future use.
       "startTime": "A String", # Start time for the daily backup configuration in UTC timezone in the 24 hour format - *HH:MM*.
       "transactionLogRetentionDays": 42, # The number of days of transaction logs we retain for point in time restore, from 1-7.
@@ -1131,6 +1132,7 @@
   "scheduledMaintenance": { # Any scheduled maintenancce for this instance. # The start time of any upcoming scheduled maintenance for this instance.
     "canDefer": True or False,
     "canReschedule": True or False, # If the scheduled maintenance can be rescheduled.
+    "scheduleDeadlineTime": "A String", # Maintenance cannot be rescheduled to start beyond this deadline.
     "startTime": "A String", # The start time of any upcoming scheduled maintenance for this instance.
   },
   "secondaryGceZone": "A String", # The Compute Engine zone that the failover instance is currently serving from for a regional instance. This value could be different from the zone that was specified when the instance was created if the instance has failed over to its secondary/failover zone. Reserved for future use.
@@ -1166,7 +1168,7 @@
       "enabled": True or False, # Whether this configuration is enabled.
       "kind": "A String", # This is always *sql#backupConfiguration*.
       "location": "A String", # Location of the backup
-      "pointInTimeRecoveryEnabled": True or False, # Reserved for future use.
+      "pointInTimeRecoveryEnabled": True or False, # (Postgres only) Whether point in time recovery is enabled.
       "replicationLogArchivingEnabled": True or False, # Reserved for future use.
       "startTime": "A String", # Start time for the daily backup configuration in UTC timezone in the 24 hour format - *HH:MM*.
       "transactionLogRetentionDays": 42, # The number of days of transaction logs we retain for point in time restore, from 1-7.
@@ -1409,6 +1411,7 @@
       "scheduledMaintenance": { # Any scheduled maintenancce for this instance. # The start time of any upcoming scheduled maintenance for this instance.
         "canDefer": True or False,
         "canReschedule": True or False, # If the scheduled maintenance can be rescheduled.
+        "scheduleDeadlineTime": "A String", # Maintenance cannot be rescheduled to start beyond this deadline.
         "startTime": "A String", # The start time of any upcoming scheduled maintenance for this instance.
       },
       "secondaryGceZone": "A String", # The Compute Engine zone that the failover instance is currently serving from for a regional instance. This value could be different from the zone that was specified when the instance was created if the instance has failed over to its secondary/failover zone. Reserved for future use.
@@ -1444,7 +1447,7 @@
           "enabled": True or False, # Whether this configuration is enabled.
           "kind": "A String", # This is always *sql#backupConfiguration*.
           "location": "A String", # Location of the backup
-          "pointInTimeRecoveryEnabled": True or False, # Reserved for future use.
+          "pointInTimeRecoveryEnabled": True or False, # (Postgres only) Whether point in time recovery is enabled.
           "replicationLogArchivingEnabled": True or False, # Reserved for future use.
           "startTime": "A String", # Start time for the daily backup configuration in UTC timezone in the 24 hour format - *HH:MM*.
           "transactionLogRetentionDays": 42, # The number of days of transaction logs we retain for point in time restore, from 1-7.
@@ -1659,6 +1662,7 @@
   "scheduledMaintenance": { # Any scheduled maintenancce for this instance. # The start time of any upcoming scheduled maintenance for this instance.
     "canDefer": True or False,
     "canReschedule": True or False, # If the scheduled maintenance can be rescheduled.
+    "scheduleDeadlineTime": "A String", # Maintenance cannot be rescheduled to start beyond this deadline.
     "startTime": "A String", # The start time of any upcoming scheduled maintenance for this instance.
   },
   "secondaryGceZone": "A String", # The Compute Engine zone that the failover instance is currently serving from for a regional instance. This value could be different from the zone that was specified when the instance was created if the instance has failed over to its secondary/failover zone. Reserved for future use.
@@ -1694,7 +1698,7 @@
       "enabled": True or False, # Whether this configuration is enabled.
       "kind": "A String", # This is always *sql#backupConfiguration*.
       "location": "A String", # Location of the backup
-      "pointInTimeRecoveryEnabled": True or False, # Reserved for future use.
+      "pointInTimeRecoveryEnabled": True or False, # (Postgres only) Whether point in time recovery is enabled.
       "replicationLogArchivingEnabled": True or False, # Reserved for future use.
       "startTime": "A String", # Start time for the daily backup configuration in UTC timezone in the 24 hour format - *HH:MM*.
       "transactionLogRetentionDays": 42, # The number of days of transaction logs we retain for point in time restore, from 1-7.
@@ -2648,6 +2652,7 @@
   "scheduledMaintenance": { # Any scheduled maintenancce for this instance. # The start time of any upcoming scheduled maintenance for this instance.
     "canDefer": True or False,
     "canReschedule": True or False, # If the scheduled maintenance can be rescheduled.
+    "scheduleDeadlineTime": "A String", # Maintenance cannot be rescheduled to start beyond this deadline.
     "startTime": "A String", # The start time of any upcoming scheduled maintenance for this instance.
   },
   "secondaryGceZone": "A String", # The Compute Engine zone that the failover instance is currently serving from for a regional instance. This value could be different from the zone that was specified when the instance was created if the instance has failed over to its secondary/failover zone. Reserved for future use.
@@ -2683,7 +2688,7 @@
       "enabled": True or False, # Whether this configuration is enabled.
       "kind": "A String", # This is always *sql#backupConfiguration*.
       "location": "A String", # Location of the backup
-      "pointInTimeRecoveryEnabled": True or False, # Reserved for future use.
+      "pointInTimeRecoveryEnabled": True or False, # (Postgres only) Whether point in time recovery is enabled.
       "replicationLogArchivingEnabled": True or False, # Reserved for future use.
       "startTime": "A String", # Start time for the daily backup configuration in UTC timezone in the 24 hour format - *HH:MM*.
       "transactionLogRetentionDays": 42, # The number of days of transaction logs we retain for point in time restore, from 1-7.