build(deps-dev): bump pygithub from 2.8.1 to 2.9.0

Bumps [pygithub](https://github.com/pygithub/pygithub) from 2.8.1 to 2.9.0.
- [Release notes](https://github.com/pygithub/pygithub/releases)
- [Changelog](https://github.com/PyGithub/PyGithub/blob/main/doc/changes.rst)
- [Commits](https://github.com/pygithub/pygithub/compare/v2.8.1...v2.9.0)

---
updated-dependencies:
- dependency-name: pygithub
  dependency-version: 2.9.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -149,7 +149,7 @@ dev = [
     "isort==8.0.0",
     "mypy==1.19.1",
     "mypy-protobuf==5.0.0",
-    "PyGithub==2.8.1",
+    "PyGithub==2.9.0",
     "bump-my-version==1.3.0",
     # type stubs for mypy
     "types-backports==0.1.3",