chore(deps): bump types-protobuf from 6.30.2.20250516 to 6.30.2.20250703

Bumps [types-protobuf](https://github.com/typeshed-internal/stub_uploader) from 6.30.2.20250516 to 6.30.2.20250703.
- [Commits](https://github.com/typeshed-internal/stub_uploader/commits)

---
updated-dependencies:
- dependency-name: types-protobuf
  dependency-version: 6.30.2.20250703
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

pyproject.toml

@@ -84,7 +84,7 @@ dev-mypy = [
   "grpc-stubs == 1.53.0.6",
   "pandas-stubs == 2.3.0.250703",
   "types-Markdown == 3.8.0.20250415",
-  "types-protobuf == 6.30.2.20250516",
+  "types-protobuf == 6.30.2.20250703",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-client-electricity-trading[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]