Build(deps-dev): Bump types-protobuf

Bumps [types-protobuf](https://github.com/python/typeshed) from 7.35.1.20260827 to 7.35.1.20260906.
- [Commits](https://github.com/python/typeshed/commits)

---
updated-dependencies:
- dependency-name: types-protobuf
  dependency-version: 7.35.1.20260906
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -69,7 +69,7 @@ dev-mkdocs = [
 dev-mypy = [
   "mypy == 2.3.1",
   "types-Markdown == 3.10.2.20260712",
-  "types-protobuf == 7.35.1.20260827",
+  "types-protobuf == 7.35.1.20260906",
   # For checking the noxfile, docs/ script, and tests
   "frequenz-client-reporting[dev-mkdocs,dev-noxfile,dev-pytest]",
   "pandas-stubs >= 2, < 4",  # Only required for example