update repo-metadata file

Author: ohmayr

packages/gapic-generator/.repo-metadata.json

@@ -7,7 +7,7 @@
     "release_level": "stable",
     "language": "python",
     "library_type": "CORE",
-    "repo": "googleapis/gapic-generator-python",
+    "repo": "googleapis/google-cloud-python",
     "distribution_name": "gapic-generator",
     "default_version": "",
     "codeowner_team": "@googleapis/cloud-sdk-python-team"