build(deps): bump pygithub from 1.59.1 to 2.6.1 in /dev-tools/scripts (#14468)

Bumps [pygithub](https://github.com/pygithub/pygithub) from 1.59.1 to 2.6.1.
- [Release notes](https://github.com/pygithub/pygithub/releases)
- [Changelog](https://github.com/PyGithub/PyGithub/blob/v2.6.1/doc/changes.rst)
- [Commits](PyGithub/PyGithub@v1.59.1...v2.6.1)

---
updated-dependencies:
- dependency-name: pygithub
  dependency-version: 2.6.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

dev-tools/scripts/requirements.txt

@@ -4,7 +4,7 @@ PyYAML==6.0.2
 holidays==0.70
 ics==0.7.2
 console-menu==0.8.0
-PyGithub==1.59.1
+PyGithub==2.6.1
 jira==3.8.0
 basedpyright==1.28.5
 ruff==0.11.5