chore(deps): bump pygithub in /.github/workflows/update-tests (#2814)

Bumps [pygithub](https://github.com/pygithub/pygithub) from 2.2.0 to 2.3.0.
- [Release notes](https://github.com/pygithub/pygithub/releases)
- [Changelog](https://github.com/PyGithub/PyGithub/blob/main/doc/changes.rst)
- [Commits](PyGithub/PyGithub@v2.2.0...v2.3.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/update-tests/requirements.txt

@@ -1 +1 @@
-PyGithub==2.2.0
+PyGithub==2.3.0