chore(deps): bump grpcio in the production-dependencies group

Bumps the production-dependencies group with 1 update: [grpcio](https://github.com/grpc/grpc).


Updates `grpcio` from 1.67.1 to 1.68.0
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.67.1...v1.68.0)

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

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