[chore] group all cloud.google.com/go mod updates (#34354)

Author: songy23

renovate.json

@@ -77,6 +77,11 @@
         "matchSourceUrlPrefixes": ["https://go.opentelemetry.io/otel"],
         "groupName": "All go.opentelemetry.io/otel packages"
       },
+      {
+        "matchManagers": ["gomod"],
+        "matchPackagePrefixes": ["cloud.google.com/go"],
+        "groupName": "All cloud.google.com/go packages"
+      },
       {
         "matchManagers": ["gomod"],
         "matchSourceUrlPrefixes": ["https://github.com/googlecloudplatform"],