[dependency]: Bump alabaster from 0.7.12 to 0.7.13

Bumps [alabaster](https://github.com/bitprophet/alabaster) from 0.7.12 to 0.7.13.
- [Release notes](https://github.com/bitprophet/alabaster/releases)
- [Changelog](https://github.com/sphinx-doc/alabaster/blob/0.x/docs/changelog.rst)
- [Commits](sphinx-doc/alabaster@0.7.12...0.7.13)

---
updated-dependencies:
- dependency-name: alabaster
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -1,5 +1,5 @@
 ablog==0.10.29
-alabaster==0.7.12
+alabaster==0.7.13
 Babel==2.12.1
 imagesize==1.4.1
 Jinja2==3.1.2