Update protobuf.yml
To fix
@@ -29,7 +29,6 @@ platforms:
- "-//:py_message_factory_test"
- "-//:py_message_test"
- "-//:py_reflection_test"
- - "-//:py_service_reflection_test"
- "-//:py_symbol_database_test"
- "-//:py_text_format_test"
- "-//:py_unknown_fields_test"
