Bump types-protobuf from 5.29.1.20250403 to 6.30.2.20250503

Bumps [types-protobuf](https://github.com/typeshed-internal/stub_uploader) from 5.29.1.20250403 to 6.30.2.20250503.
- [Commits](https://github.com/typeshed-internal/stub_uploader/commits)

---
updated-dependencies:
- dependency-name: types-protobuf
  dependency-version: 6.30.2.20250503
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]