Update grpc-java version to 1.10.0

Posted by liqweed:

The current version of grpc-java dependency version is 1.7.0 there have been many improvements since:

We’re using gRPC in our endpoints as well as the dgraph client and get grpc-java as a transitive dependency. We’d like to take advantage of the newer version.

deepakjois commented :

I will create a pull request for this, and make sure the CI does not complain. After that, it should be trivial to merge it

deepakjois commented :

The build passes, so this should be a safe upgrade. I will create a PR from the web interface, but I no longer have a working setup for this, so somebody else will have to pull this in.