chore: have renovate label protoc and protoc grpc as test deps (#1709)

* chore: have renovate label protoc and protoc grpc as test deps

* remove space

Author: kolea2

renovate.json

@@ -52,7 +52,9 @@
         "^com.google.truth:truth",
         "^org.mockito:mockito-core",
         "^org.objenesis:objenesis",
-        "^com.google.cloud:google-cloud-conformance-tests"
+        "^com.google.cloud:google-cloud-conformance-tests",
+        "^io.grpc:protoc-gen-grpc-java",
+        "^com.google.protobuf:protoc"
       ],
       "semanticCommitType": "test",
       "semanticCommitScope": "deps"