Bump pygithub from 2.7.0 to 2.8.1 (#13100)

Bumps [pygithub](https://github.com/pygithub/pygithub) from 2.7.0 to 2.8.1.
- [Release notes](https://github.com/pygithub/pygithub/releases)
- [Changelog](https://github.com/PyGithub/PyGithub/blob/main/doc/changes.rst)
- [Commits](PyGithub/PyGithub@v2.7.0...v2.8.1)

---
updated-dependencies:
- dependency-name: pygithub
  dependency-version: 2.8.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -26,7 +26,7 @@ djangorestframework==3.16.1
 html2text==2025.4.15
 humanize==4.13.0
 jira==3.8.0
-PyGithub==2.7.0
+PyGithub==2.8.1
 lxml==6.0.1
 Markdown==3.9
 openpyxl==3.1.5