Bump the python-packages group with 1 update

Bumps the python-packages group with 1 update: [alabaster](https://github.com/sphinx-doc/alabaster).


Updates `alabaster` from 0.7.13 to 0.7.15
- [Release notes](https://github.com/sphinx-doc/alabaster/releases)
- [Changelog](https://github.com/sphinx-doc/alabaster/blob/master/docs/changelog.rst)
- [Commits](sphinx-doc/alabaster@0.7.13...0.7.15)

---
updated-dependencies:
- dependency-name: alabaster
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: python-packages
...

Signed-off-by: dependabot[bot] <[email protected]>