Bump flask-sqlalchemy from 2.4.3 to 2.4.4 in /backend

Bumps [flask-sqlalchemy](https://github.com/pallets/flask-sqlalchemy) from 2.4.3 to 2.4.4.
- [Release notes](https://github.com/pallets/flask-sqlalchemy/releases)
- [Changelog](https://github.com/pallets/flask-sqlalchemy/blob/master/CHANGES.rst)
- [Commits](pallets-eco/flask-sqlalchemy@2.4.3...2.4.4)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Author: dependabot-preview[bot]

backend/requirements.txt

@@ -2,6 +2,6 @@ flask>=0.12.3
 gevent==20.12.1
 Flask-Cors==3.0.10
 Flask-Security==3.0.0
-Flask-SQLAlchemy==2.4.3
+Flask-SQLAlchemy==2.4.4
 git+https://github.com/ansrivas/pylogging.git
 flask-jwt-simple[asymmetric_crypto]