chore(deps): Bump grpcio-tools in /backend/python/parler-tts

Bumps [grpcio-tools](https://github.com/grpc/grpc) from 1.42.0 to 1.67.0.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.42.0...v1.67.0)

---
updated-dependencies:
- dependency-name: grpcio-tools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

backend/python/parler-tts/requirements-after.txt

@@ -1,4 +1,4 @@
 git+https://github.com/huggingface/parler-tts.git@8e465f1b5fcd223478e07175cb40494d19ffbe17
 llvmlite==0.43.0
 numba==0.60.0
-grpcio-tools==1.42.0
+grpcio-tools==1.67.0