chore: update .repo-metadata.json (#346)

Author: parthea

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

@@ -4,13 +4,14 @@
     "product_documentation": "https://cloud.google.com/resource-manager/docs/cloud-asset-inventory/overview",
     "client_documentation": "https://cloud.google.com/python/docs/reference/cloudasset/latest",
     "issue_tracker": "https://issuetracker.google.com/savedsearches/559757",
-    "release_level": "ga",
+    "release_level": "stable",
     "language": "python",
     "library_type": "GAPIC_AUTO",
     "repo": "googleapis/python-asset",
     "distribution_name": "google-cloud-asset",
     "api_id": "cloudasset.googleapis.com",
     "requires_billing": true,
     "default_version": "v1",
-    "codeowner_team": ""
+    "codeowner_team": "",
+    "api_shortname": "cloudasset"
 }