chore: update .repo-metadata.json (#217)

Author: parthea

packages/google-cloud-kms/.repo-metadata.json

@@ -4,7 +4,7 @@
     "product_documentation": "https://cloud.google.com/kms",
     "client_documentation": "https://cloud.google.com/python/docs/reference/cloudkms/latest",
     "issue_tracker": "https://issuetracker.google.com/savedsearches/5264932",
-    "release_level": "ga",
+    "release_level": "stable",
     "language": "python",
     "library_type": "GAPIC_AUTO",
     "repo": "googleapis/python-kms",
@@ -24,5 +24,6 @@
         }
     ],
     "default_version": "v1",
-    "codeowner_team": ""
+    "codeowner_team": "",
+    "api_shortname": "cloudkms"
 }