Bump babel from 0.9.6 to 2.9.1 in /installer

Bumps [babel](https://github.com/python-babel/babel) from 0.9.6 to 2.9.1.
- [Release notes](https://github.com/python-babel/babel/releases)
- [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES.rst)
- [Commits](https://github.com/python-babel/babel/commits/v2.9.1)

---
updated-dependencies:
- dependency-name: babel
  dependency-type: direct:production
...

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2 files changed