Update flask-babel requirement from <4,>=1.0 to >=1.0,<5

Updates the requirements on [flask-babel](https://github.com/python-babel/flask-babel) to permit the latest version.
- [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@v1.0.0...v4.0.0)

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

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

pyproject.toml

@@ -29,7 +29,7 @@ dependencies = [
     "cachetools>=4.1,<5",
     "debts>=0.5,<1",
     "email_validator>=1.0,<3",
-    "Flask-Babel>=1.0,<4",
+    "Flask-Babel>=1.0,<5",
     "Flask-Cors>=3.0.8,<4",
     "Flask-Limiter>=2.6,<3",
     "Flask-Mail>=0.9.1,<1",