chore: Update discovery artifacts (#1366)

## Discovery Artifact Change Summary:
feat(adexchangebuyer): update the api https://github.com/googleapis/google-api-python-client/commit/46d87cb3e1f85ec9201134402b3c3afd2eb55770
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/adaafffbdeab31f05f9ad62d0f58846313bb3858
feat(content): update the api https://github.com/googleapis/google-api-python-client/commit/3b3e9be7e17c4efa89b45ac671a7c7f627a34cd7
feat(dialogflow): update the api https://github.com/googleapis/google-api-python-client/commit/254b9413a2ede306917031a2117f7af2df28a103
feat(manufacturers): update the api https://github.com/googleapis/google-api-python-client/commit/25bf19f14a09428ab3fc6e51b0f6812867f99b04
feat(prod_tt_sasportal): update the api https://github.com/googleapis/google-api-python-client/commit/af243b57a7039f4e01259fb085c7b07a66106fcf
feat(redis): update the api https://github.com/googleapis/google-api-python-client/commit/5228389cbd5fceb1bf8c2d36086faa147d91e50f
feat(remotebuildexecution): update the api https://github.com/googleapis/google-api-python-client/commit/7c8b314e5508dda81cfb673039ea032f593fa97d
diff --git a/googleapiclient/discovery_cache/documents/prod_tt_sasportal.v1alpha1.json b/googleapiclient/discovery_cache/documents/prod_tt_sasportal.v1alpha1.json
index 3850fbb..1963a81 100644
--- a/googleapiclient/discovery_cache/documents/prod_tt_sasportal.v1alpha1.json
+++ b/googleapiclient/discovery_cache/documents/prod_tt_sasportal.v1alpha1.json
@@ -2484,7 +2484,7 @@
       }
     }
   },
-  "revision": "20210513",
+  "revision": "20210520",
   "rootUrl": "https://prod-tt-sasportal.googleapis.com/",
   "schemas": {
     "SasPortalAssignment": {
@@ -2598,6 +2598,14 @@
           "description": "The deployment's display name.",
           "type": "string"
         },
+        "frns": {
+          "description": "Output only. The FRNs copied from its direct parent.",
+          "items": {
+            "type": "string"
+          },
+          "readOnly": true,
+          "type": "array"
+        },
         "name": {
           "description": "Output only. Resource name.",
           "readOnly": true,