Bump babel from 2.9.0 to 2.9.1

Bumps [babel](https://github.com/python-babel/babel) from 2.9.0 to 2.9.1. - [Release notes](https://github.com/python-babel/babel/releases) - [Changelog](https://github.com/python-babel/babel/blob/master/CHANGES) - [Commits](python-babel/babel@v2.9.0...v2.9.1) --- updated-dependencies: - dependency-name: babel dependency-type: indirect ... Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]