message: Update tower-grpc dependency
  tower-grpc-build now requires HTTP stack selection feature
  to generate support code for the stack.
diff: @@ -26,8 +26,9 @@ tower-util = "0.1"
  [dependencies.tower-grpc]
  git = "https://github.com/tower-rs/tower-grpc"
  -rev = "597f56ce0eb47267a17cebe4b0120a713c12a3c0"
  +rev = "b67569b5aace78595b2813b25ab7feacc28311b7"
  [build-dependencies.tower-grpc-build]
  git = "https://github.com/tower-rs/tower-grpc"
  -rev = "597f56ce0eb47267a17cebe4b0120a713c12a3c0"
  +rev = "b67569b5aace78595b2813b25ab7feacc28311b7"
  +features = ["tower-h2"]
  