Bump flask-babel from 3.1.0 to 4.0.0 (#3460)

Bumps [flask-babel](https://github.com/python-babel/flask-babel) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/python-babel/flask-babel/releases)
- [Changelog](https://github.com/python-babel/flask-babel/blob/master/CHANGELOG)
- [Commits](python-babel/flask-babel@v3.1.0...v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -14,7 +14,7 @@ Flask-SQLAlchemy==3.0.5
 Flask-Mail==0.9.1
 Flask-Migrate==4.0.5
 Flask-Cors==4.0.0
-Flask-Babel==3.1.0
+Flask-Babel==4.0.0
 flask-talisman==1.1.0
 SQLAlchemy==2.0.21
 alembic==1.13.1