Bump grpcio-tools from 1.46.3 to 1.47.0 (#261)

Bumps [grpcio-tools](https://github.com/grpc/grpc) from 1.46.3 to 1.47.0.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.46.3...v1.47.0)

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

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