Bump babel from 2.9.1 to 2.16.0 in /docs

Bumps [babel](https://github.com/python-babel/babel) from 2.9.1 to 2.16.0.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES.rst)
- [Commits](python-babel/babel@v2.9.1...v2.16.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -1,5 +1,5 @@
 alabaster==0.7.12
-Babel==2.9.1
+Babel==2.16.0
 certifi==2024.7.4
 chardet==3.0.4
 docutils==0.14