Upgrade gRPC version - Getting segfaults in node cluster

[dankraus]

Hi,

We just started using these libraries (pubsub) in production which run in a cluster under PM2. Since deploying, we've have a sudden surge in segfaults in our processes. We're confident that it stems from this depedency and gRPC. The team there has evidently just recently fixed it in version 1.14.1 with this PR grpc/grpc-node#492 for this issue grpc/grpc-node#490

Can this be upgraded?