chore: Update discovery artifacts (#1462)

## Deleted keys were detected in the following stable discovery artifacts:
sqladmin v1 https://github.com/googleapis/google-api-python-client/commit/cef24d829ab5be71563a2b668b8f6cf5dda2c8e4

## Deleted keys were detected in the following pre-stable discovery artifacts:
alertcenter v1beta1 https://github.com/googleapis/google-api-python-client/commit/70810a52c85c6d0d6f00d7afb41c8608261eaebc

## Discovery Artifact Change Summary:
feat(alertcenter): update the api https://github.com/googleapis/google-api-python-client/commit/70810a52c85c6d0d6f00d7afb41c8608261eaebc
feat(chat): update the api https://github.com/googleapis/google-api-python-client/commit/a577cd0b71951176bbf849c1f7f139127205da54
feat(cloudbuild): update the api https://github.com/googleapis/google-api-python-client/commit/9066056a8b106d441fb7686fe84359484d0d58bc
feat(content): update the api https://github.com/googleapis/google-api-python-client/commit/b123349da33c11c0172a8efb3fadef685a30e6e1
feat(displayvideo): update the api https://github.com/googleapis/google-api-python-client/commit/c525d726ee6cffdd4bc7afd69080d5e52bae83a0
feat(dns): update the api https://github.com/googleapis/google-api-python-client/commit/13436ccd2b835fda5cb86952ac4ea991ee8651d8
feat(eventarc): update the api https://github.com/googleapis/google-api-python-client/commit/6be3394a64a5eb509f68ef779680fd36837708ee
feat(file): update the api https://github.com/googleapis/google-api-python-client/commit/817a0e636771445a988ef479bd52740f754b901a
feat(monitoring): update the api https://github.com/googleapis/google-api-python-client/commit/bd32149f308467f0f659119587afc77dcec65b14
feat(people): update the api https://github.com/googleapis/google-api-python-client/commit/aa6b47df40c5289f33aef6fb6aa007df2d038e20
feat(retail): update the api https://github.com/googleapis/google-api-python-client/commit/d39f06e2d77034bc837604a41dd52c577f158bf2
feat(securitycenter): update the api https://github.com/googleapis/google-api-python-client/commit/999fab5178208639c9eef289f9f441052ed832fc
feat(speech): update the api https://github.com/googleapis/google-api-python-client/commit/3b2c0fa62b2a0c86bba1e97f1b18f93250dbd551
feat(sqladmin): update the api https://github.com/googleapis/google-api-python-client/commit/cef24d829ab5be71563a2b668b8f6cf5dda2c8e4
diff --git a/googleapiclient/discovery_cache/documents/eventarc.v1.json b/googleapiclient/discovery_cache/documents/eventarc.v1.json
index 9939922..f91df0e 100644
--- a/googleapiclient/discovery_cache/documents/eventarc.v1.json
+++ b/googleapiclient/discovery_cache/documents/eventarc.v1.json
@@ -177,6 +177,97 @@
             }
           },
           "resources": {
+            "channels": {
+              "methods": {
+                "getIamPolicy": {
+                  "description": "Gets the access control policy for a resource. Returns an empty policy if the resource exists and does not have a policy set.",
+                  "flatPath": "v1/projects/{projectsId}/locations/{locationsId}/channels/{channelsId}:getIamPolicy",
+                  "httpMethod": "GET",
+                  "id": "eventarc.projects.locations.channels.getIamPolicy",
+                  "parameterOrder": [
+                    "resource"
+                  ],
+                  "parameters": {
+                    "options.requestedPolicyVersion": {
+                      "description": "Optional. The policy format version to be returned. Valid values are 0, 1, and 3. Requests specifying an invalid value will be rejected. Requests for policies with any conditional bindings must specify version 3. Policies without any conditional bindings may specify any valid value or leave the field unset. To learn which resources support conditions in their IAM policies, see the [IAM documentation](https://cloud.google.com/iam/help/conditions/resource-policies).",
+                      "format": "int32",
+                      "location": "query",
+                      "type": "integer"
+                    },
+                    "resource": {
+                      "description": "REQUIRED: The resource for which the policy is being requested. See the operation documentation for the appropriate value for this field.",
+                      "location": "path",
+                      "pattern": "^projects/[^/]+/locations/[^/]+/channels/[^/]+$",
+                      "required": true,
+                      "type": "string"
+                    }
+                  },
+                  "path": "v1/{+resource}:getIamPolicy",
+                  "response": {
+                    "$ref": "Policy"
+                  },
+                  "scopes": [
+                    "https://www.googleapis.com/auth/cloud-platform"
+                  ]
+                },
+                "setIamPolicy": {
+                  "description": "Sets the access control policy on the specified resource. Replaces any existing policy. Can return `NOT_FOUND`, `INVALID_ARGUMENT`, and `PERMISSION_DENIED` errors.",
+                  "flatPath": "v1/projects/{projectsId}/locations/{locationsId}/channels/{channelsId}:setIamPolicy",
+                  "httpMethod": "POST",
+                  "id": "eventarc.projects.locations.channels.setIamPolicy",
+                  "parameterOrder": [
+                    "resource"
+                  ],
+                  "parameters": {
+                    "resource": {
+                      "description": "REQUIRED: The resource for which the policy is being specified. See the operation documentation for the appropriate value for this field.",
+                      "location": "path",
+                      "pattern": "^projects/[^/]+/locations/[^/]+/channels/[^/]+$",
+                      "required": true,
+                      "type": "string"
+                    }
+                  },
+                  "path": "v1/{+resource}:setIamPolicy",
+                  "request": {
+                    "$ref": "SetIamPolicyRequest"
+                  },
+                  "response": {
+                    "$ref": "Policy"
+                  },
+                  "scopes": [
+                    "https://www.googleapis.com/auth/cloud-platform"
+                  ]
+                },
+                "testIamPermissions": {
+                  "description": "Returns permissions that a caller has on the specified resource. If the resource does not exist, this will return an empty set of permissions, not a `NOT_FOUND` error. Note: This operation is designed to be used for building permission-aware UIs and command-line tools, not for authorization checking. This operation may \"fail open\" without warning.",
+                  "flatPath": "v1/projects/{projectsId}/locations/{locationsId}/channels/{channelsId}:testIamPermissions",
+                  "httpMethod": "POST",
+                  "id": "eventarc.projects.locations.channels.testIamPermissions",
+                  "parameterOrder": [
+                    "resource"
+                  ],
+                  "parameters": {
+                    "resource": {
+                      "description": "REQUIRED: The resource for which the policy detail is being requested. See the operation documentation for the appropriate value for this field.",
+                      "location": "path",
+                      "pattern": "^projects/[^/]+/locations/[^/]+/channels/[^/]+$",
+                      "required": true,
+                      "type": "string"
+                    }
+                  },
+                  "path": "v1/{+resource}:testIamPermissions",
+                  "request": {
+                    "$ref": "TestIamPermissionsRequest"
+                  },
+                  "response": {
+                    "$ref": "TestIamPermissionsResponse"
+                  },
+                  "scopes": [
+                    "https://www.googleapis.com/auth/cloud-platform"
+                  ]
+                }
+              }
+            },
             "operations": {
               "methods": {
                 "cancel": {
@@ -584,7 +675,7 @@
       }
     }
   },
-  "revision": "20210709",
+  "revision": "20210723",
   "rootUrl": "https://eventarc.googleapis.com/",
   "schemas": {
     "AuditConfig": {