chore: Update discovery artifacts (#1356)

## Deleted keys were detected in the following stable discovery artifacts:
compute v1 https://github.com/googleapis/google-api-python-client/commit/685c19d4b5262d27a2b1016e01186188afe610fd
genomics v1 https://github.com/googleapis/google-api-python-client/commit/d0e6cc48df2d0a00d91ce6fbab83aa82146f3573

## Deleted keys were detected in the following pre-stable discovery artifacts:
compute alpha https://github.com/googleapis/google-api-python-client/commit/685c19d4b5262d27a2b1016e01186188afe610fd
compute beta https://github.com/googleapis/google-api-python-client/commit/685c19d4b5262d27a2b1016e01186188afe610fd
genomics v2alpha1 https://github.com/googleapis/google-api-python-client/commit/d0e6cc48df2d0a00d91ce6fbab83aa82146f3573

## Discovery Artifact Change Summary:
feat(analyticsadmin): update the api https://github.com/googleapis/google-api-python-client/commit/9648bae09873a132e7b4627096c153043911be6e
feat(artifactregistry): update the api https://github.com/googleapis/google-api-python-client/commit/7dd722fe8b0ae822f4847219c442aa67a1aae7fd
feat(assuredworkloads): update the api https://github.com/googleapis/google-api-python-client/commit/9b84ffce415133e860cc55bfbd3b9c15c3d46a24
feat(cloudasset): update the api https://github.com/googleapis/google-api-python-client/commit/a8228db5ef31724493f0f62bf8062aca9adc44aa
feat(cloudbuild): update the api https://github.com/googleapis/google-api-python-client/commit/c9d8208c0f9579d958224566af369b809e13016a
feat(compute): update the api https://github.com/googleapis/google-api-python-client/commit/685c19d4b5262d27a2b1016e01186188afe610fd
feat(container): update the api https://github.com/googleapis/google-api-python-client/commit/c5cd244f996b1dfb605ef28eb22f8b0e76bffa1b
feat(dialogflow): update the api https://github.com/googleapis/google-api-python-client/commit/0c6b31fd2deb75ca1c023fed36903b638f5e74f8
feat(documentai): update the api https://github.com/googleapis/google-api-python-client/commit/6dcec9fd8c0f803d37b4c8355870208e5a8c61ce
feat(drive): update the api https://github.com/googleapis/google-api-python-client/commit/8788823461610f31eebd655915e07def9690da48
feat(genomics): update the api https://github.com/googleapis/google-api-python-client/commit/d0e6cc48df2d0a00d91ce6fbab83aa82146f3573
feat(logging): update the api https://github.com/googleapis/google-api-python-client/commit/7f5fa161fd3db9ca6f2df23f5c8bd41ba01e9b9c
feat(privateca): update the api https://github.com/googleapis/google-api-python-client/commit/0a5c31d74f788444640c174c413b12d494a00f1a
feat(pubsublite): update the api https://github.com/googleapis/google-api-python-client/commit/dd67e9b117fdc8d0d0ecff6ade657003a95c12f7
feat(recommender): update the api https://github.com/googleapis/google-api-python-client/commit/4b261d97bea2a8bc042a274c2d904be09da2d82c
diff --git a/googleapiclient/discovery_cache/documents/artifactregistry.v1.json b/googleapiclient/discovery_cache/documents/artifactregistry.v1.json
index 603cde7..7348eb1 100644
--- a/googleapiclient/discovery_cache/documents/artifactregistry.v1.json
+++ b/googleapiclient/discovery_cache/documents/artifactregistry.v1.json
@@ -348,7 +348,7 @@
       }
     }
   },
-  "revision": "20210430",
+  "revision": "20210509",
   "rootUrl": "https://artifactregistry.googleapis.com/",
   "schemas": {
     "CancelOperationRequest": {
@@ -358,16 +358,21 @@
       "type": "object"
     },
     "DockerImage": {
-      "description": "DockerImage represents a docker artifact.",
+      "description": "DockerImage represents a docker artifact. The following fields are returned as untyped metadata in the Version resource, using camelcase keys (i.e. metadata.imageSizeBytes): - imageSizeBytes - mediaType - buildTime",
       "id": "DockerImage",
       "properties": {
+        "buildTime": {
+          "description": "The time this image was built. This field is returned as the 'metadata.buildTime' field in the Version resource. The build time is returned to the client as an RFC 3339 string, which can be easily used with the JavaScript Date constructor and keeps the Version timestamps returned via OnePlatform consistent, as JSON marshals google.protobuf.Timestamp into an RFC 3339 string. (http://google3/cloud/containers/artifacts/metadata/v1beta2/builder/data.go?l=158-159&rcl=364878183).",
+          "format": "google-datetime",
+          "type": "string"
+        },
         "imageSizeBytes": {
-          "description": "Calculated size of the image.",
+          "description": "Calculated size of the image. This field is returned as the 'metadata.imageSizeBytes' field in the Version resource.",
           "format": "int64",
           "type": "string"
         },
         "mediaType": {
-          "description": "Media type of this image, e.g. \"application/vnd.docker.distribution.manifest.v2+json\".",
+          "description": "Media type of this image, e.g. \"application/vnd.docker.distribution.manifest.v2+json\". This field is returned as the 'metadata.mediaType' field in the Version resource.",
           "type": "string"
         },
         "name": {