Bump flask-sqlalchemy from 2.4.4 to 2.5.1

Bumps [flask-sqlalchemy](https://github.com/pallets/flask-sqlalchemy) from 2.4.4 to 2.5.1.
- [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@2.4.4...2.5.1)

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Author: dependabot-preview[bot]