Bump flask-sqlalchemy from 2.5.1 to 3.1.1

Bumps [flask-sqlalchemy](https://github.com/pallets-eco/flask-sqlalchemy) from 2.5.1 to 3.1.1.
- [Release notes](https://github.com/pallets-eco/flask-sqlalchemy/releases)
- [Changelog](https://github.com/pallets-eco/flask-sqlalchemy/blob/main/CHANGES.rst)
- [Commits](pallets-eco/flask-sqlalchemy@2.5.1...3.1.1)

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

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

requirements.txt

@@ -15,7 +15,7 @@ Flask-Login==0.5.0
 Flask-Mail==0.9.1
 Flask-Migrate==4.0.0
 Flask-RESTful==0.3.9
-Flask-SQLAlchemy==2.5.1
+Flask-SQLAlchemy==3.1.1
 greenlet==2.0.1
 gunicorn==20.1.0
 idna==2.10