Bump babel from 2.12.1 to 2.16.0

Bumps [babel](https://github.com/python-babel/babel) from 2.12.1 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@v2.12.1...v2.16.0)

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

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

requirements.txt

@@ -12,7 +12,7 @@ backports.ssl-match-hostname==3.7.0.1 # required by tornado<5.0
 patool>=1.12,<3.2  # https://github.com/wummel/patool/blob/master/doc/changelog.txt
 bcrypt>=3.1,<4.3  # https://github.com/pyca/bcrypt/
 chardet>=3.0,<5.3  # https://pypi.python.org/pypi/chardet
-babel==2.12.1  # http://babel.pocoo.org/en/latest/changelog.html
+babel==2.16.0  # http://babel.pocoo.org/en/latest/changelog.html
 pyxdg>=0.26,<0.29  # https://freedesktop.org/wiki/Software/pyxdg/
 Jinja2>=2.10,<2.11  # http://jinja.pocoo.org/docs/latest/changelog/