CMake build got broken in one of the latest versions (vcpkg)

One of the latest versions breaks vcpkg build. Here is the error: https://pastebin.com/wkECk1gx.
The problem is in `google_cloud_cpp_grpc_utils-config.cmake` line 21:

```
20: # TODO(#5726) - this is needed to preserve backwards compatibility
21: find_dependency(googleapis)
```