message: grpc: update to 1.10.0
  Description: Update gRPC dependency to 1.10.0
  Risk Level: Low as low usage of Google gRPC
  Testing: unit test, integration
  Docs Changes: N/A
  Release Notes: N/A
diff: @@ -39,7 +39,7 @@ REPOSITORY_LOCATIONS = dict(
  remote = "https://github.com/gcovr/gcovr",
  ),
  com_github_grpc_grpc = dict(
  - commit = "04ecc18e3a5b8de5bb7ffa20700364ad88dc16f9", # v1.9.0-pre3
  + commit = "474c5950686e3962bd339c93d27e369bf64f568f", # v1.10.0
  remote = "https://github.com/grpc/grpc.git",
  ),
  io_opentracing_cpp = dict(
  