update repo-metadata.json

Author: scotthart

google/cloud/maintenance/api/v1/.repo-metadata.json

@@ -3,7 +3,7 @@
     "api_shortname": "maintenance",
     "client_documentation": "https://cloud.google.com/cpp/docs/reference/maintenance/latest",
     "distribution_name": "google-cloud-cpp",
-    "issue_tracker": "https://issuetracker.google.com/issues/new?component=1673988&template=1161103",
+    "issue_tracker": "https://issuetracker.google.com/issues?q=componentid:1673988%20status=open",
     "language": "cpp",
     "library_type": "GAPIC_AUTO",
     "name_pretty": "Maintenance API",