Update flask-sqlalchemy requirement from ~=2.3.2 to ~=2.4.4 (#223)

Updates the requirements on [flask-sqlalchemy](https://github.com/pallets/flask-sqlalchemy) to permit the latest version.
- [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@2.3.2...2.4.4)

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

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ Flask~=1.1.2
 Flask-pyoidc~=2.2.0
 Flask-Mail~=0.9.1
 Flask-Gzip~=0.2
-flask_sqlalchemy~=2.3.2
+flask_sqlalchemy~=2.4.4
 psycopg2-binary~=2.8.6
 Flask-Migrate~=2.2.1
 pylint~=2.6.0