Fix elixir 1.17 warnings

[hypno2000]

Fix these warnings in elixir 1.17:

warning: using map.field notation (without parentheses) to invoke function Module.__rpc_calls__() is deprecated, you must add parentheses instead: remote.function()

Right now all projects that depend on grpc generate warnings on user project (because the warnings are generated in the macros that user projects are calling), which means it breaks user projects CI's in elixir 1.17 that use --warnings-as-errors

[hypno2000]

Is there anything i can do from my side to help it getting merged?

[sleipnir]

Thank you @hypno2000 sorry for the late answer.