Bump babel from 2.11.0 to 2.12.1 (#557)

Bumps [babel](https://github.com/python-babel/babel) from 2.11.0 to 2.12.1.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES.rst)
- [Commits](python-babel/babel@v2.11.0...v2.12.1)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Quentin Pradet <quentin.pradet@gmail.com>

docs-requirements.txt

@@ -6,7 +6,7 @@
 #
 alabaster==0.7.13
     # via sphinx
-babel==2.11.0
+babel==2.12.1
     # via sphinx
 certifi==2022.6.15
     # via requests
@@ -34,8 +34,6 @@ pycparser==2.21
     # via cffi
 pygments==2.15.1
     # via sphinx
-pytz==2023.3
-    # via babel
 requests==2.28.2
     # via sphinx
 snowballstemmer==2.2.0