Bump babel from 2.11.0 to 2.12.1

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] <[email protected]>

Author: dependabot[bot]