fix twirp deps

[amerov]

fix issue:

 Could not find compatible versions

Because twirp >= 1.7.0 depends on google-protobuf >= 3.7.0, < 4.A
  and google-protobuf >= 3.21.0, < 4.A could not be found in rubygems repository https://rubygems.org/, cached gems or installed locally for any resolution platforms (x86_64-linux),
  twirp >= 1.7.0 requires google-protobuf >= 3.7.0, < 3.21.0.
And because every version of livekit-server-sdk depends on google-protobuf >= 3.21.0, < 4.0,
  twirp >= 1.7.0 is incompatible with livekit-server-sdk >= 0.
So, because every version of livekit-server-sdk depends on twirp >= 1.10.0, < 2.0
  and Gemfile depends on livekit-server-sdk >= 0,
  version solving has failed.