Update flask-sqlalchemy to 3.1.0

[pyup-bot]

This PR updates Flask-SQLAlchemy from 3.0.5 to 3.1.0.

Changelog

3.1.0

------------- Released 2023-09-10 - Drop support for Python 3.7. :pr:`1251` - Add support for the SQLAlchemy 2.x API via ``model_class`` parameter. :issue:`1140` - Bump minimum version of SQLAlchemy to 2.0.16. - Remove previously deprecated code. - Pass extra keyword arguments from ``get_or_404`` to ``session.get``. :issue:`1149` - Fix bug with finding right bind key for clause statements. :issue:`1211` 

Links

• PyPI: https://pypi.org/project/flask-sqlalchemy
• Changelog: https://data.safetycli.com/changelogs/flask-sqlalchemy/
• Docs: https://pythonhosted.org/Flask-SQLAlchemy/