Bump flask-babel from 2.0.0 to 3.0.0

Bumps [flask-babel](https://github.com/python-babel/flask-babel) from 2.0.0 to 3.0.0.
- [Release notes](https://github.com/python-babel/flask-babel/releases)
- [Changelog](https://github.com/python-babel/flask-babel/blob/master/CHANGELOG)
- [Commits](https://github.com/python-babel/flask-babel/compare/v2.0.0...v3.0.0

)

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

Signed-off-by: dependabot[bot] <support@github.com>