message: Update tower-grpc dependency
  Sync to the latest commit in the master branch.
diff: @@ -23,8 +23,8 @@ tower-util = { git = "https://github.com/tower-rs/tower" }
  [dependencies.tower-grpc]
  git = "https://github.com/tower-rs/tower-grpc"
  -rev = "7ffa9d3b610d1c84559a811d08a25bd1670babed"
  +rev = "6f355226654ac5ad90209db3e308223c662248cb"
  [build-dependencies.tower-grpc-build]
  git = "https://github.com/tower-rs/tower-grpc"
  -rev = "7ffa9d3b610d1c84559a811d08a25bd1670babed"
  +rev = "6f355226654ac5ad90209db3e308223c662248cb"
  