chore: Update discovery artifacts (#1410)

## Deleted keys were detected in the following stable discovery artifacts:
managedidentities v1 https://github.com/googleapis/google-api-python-client/commit/e96adbb1ba3e4e56d916cc28474f85543f17ad0e

## Discovery Artifact Change Summary:
feat(appengine): update the api https://github.com/googleapis/google-api-python-client/commit/ffcf86035a751e98a763c8a2d54b70d3a55ca14d
feat(containeranalysis): update the api https://github.com/googleapis/google-api-python-client/commit/9a1c70b7df3e074fc9fbd0eebdaf75a91046078c
feat(documentai): update the api https://github.com/googleapis/google-api-python-client/commit/07a6e774ac185442a99437896eaee774946b5846
feat(drive): update the api https://github.com/googleapis/google-api-python-client/commit/773910fdf25b084aa3623d24fe99c8a1330fbecb
feat(managedidentities): update the api https://github.com/googleapis/google-api-python-client/commit/e96adbb1ba3e4e56d916cc28474f85543f17ad0e
feat(spanner): update the api https://github.com/googleapis/google-api-python-client/commit/87da2f3605ec1b8986324cddc33f2b5601d3e896
diff --git a/googleapiclient/discovery_cache/documents/androiddeviceprovisioning.v1.json b/googleapiclient/discovery_cache/documents/androiddeviceprovisioning.v1.json
index d010b16..525c619 100644
--- a/googleapiclient/discovery_cache/documents/androiddeviceprovisioning.v1.json
+++ b/googleapiclient/discovery_cache/documents/androiddeviceprovisioning.v1.json
@@ -825,7 +825,7 @@
       }
     }
   },
-  "revision": "20210604",
+  "revision": "20210608",
   "rootUrl": "https://androiddeviceprovisioning.googleapis.com/",
   "schemas": {
     "ClaimDeviceRequest": {