Bump the pip group across 1 directory with 3 updates

Bumps the pip group with 3 updates in the / directory: [grpcio](https://github.com/grpc/grpc), [grpcio-tools](https://github.com/grpc/grpc) and [mypy](https://github.com/python/mypy).


Updates `grpcio` from 1.66.1 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@v1.66.1...v1.67.0)

Updates `grpcio-tools` from 1.66.1 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@v1.66.1...v1.67.0)

Updates `mypy` from 1.11.2 to 1.12.1
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.11.2...v1.12.1)

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

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