message: fix(go_test): remove deprecated grpc call
diff: @@ -74,7 +74,8 @@ func TestGRPC(t *testing.T) {
  if err != nil {
  t.Fatalf("Failed to listen: %v", err)
  }
  - ser := grpc.NewServer(grpc.CustomCodec(flatbuffers.FlatbuffersCodec{}))
  + ser := grpc.NewServer()
  + encoding.RegisterCodec(flatbuffers.FlatbuffersCodec{})
  Example.RegisterMonsterStorageServer(ser, &server{})
  go func() {
  if err := ser.Serve(lis); err != nil {
  