fix(workflow): Disable grpcio updating until support for new protobuf…

… gets added to google-cloud (#2490)

Currently grpcio being updated is causing dependency resolution failure
because grpcio and google-cloud dependencies depend on non overlapping
protobuf versions. Until google-cloud updates to protobuf v5 , we should
add this exclusion to stop renovatebot from attempting to update grpcio.

renovate.json

@@ -27,6 +27,11 @@
       "matchCategories": ["js"],
       "groupName": "appengine-frontend"
     },
+    {
+      "matchFileNames": ["gcp/api/**"],
+      "matchPackageNames": ["grpcio*"],
+      "enabled": false
+    },
     {
       "matchFileNames": ["gcp/api/**"],
       "groupName": "api"