build(deps): bump flask-babel from 3.1.0 to 4.0.0

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]>

skbl/requirements.txt

@@ -8,7 +8,7 @@ cffi==1.15.1; platform_python_implementation == "PyPy"
 click==8.1.7
 colorama==0.4.6; platform_system == "Windows"
 flask==2.2.5
-flask-babel==3.1.0
+flask-babel==4.0.0
 flask-compress==1.15
 flask-reverse-proxy==0.2.0.2
 gunicorn==22.0.0