build(deps): bump babel from 2.12.1 to 2.13.0 in /docs

Bumps [babel](https://github.com/python-babel/babel) from 2.12.1 to 2.13.0.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES.rst)
- [Commits](python-babel/babel@v2.12.1...v2.13.0)

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

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

docs/requirements.txt

@@ -1,5 +1,5 @@
 alabaster==0.7.13
-Babel==2.12.1
+Babel==2.13.0
 certifi==2023.7.22
 chardet==5.2.0
 commonmark==0.9.1