Bump flask-sqlalchemy from 2.5.1 to 3.0.3

Bumps [flask-sqlalchemy](https://github.com/pallets-eco/flask-sqlalchemy) from 2.5.1 to 3.0.3.
- [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...3.0.3)

---
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

@@ -10,7 +10,7 @@ Flask-Login==0.6.2
 Flask-Mail==0.9.1
 Flask-Migrate==4.0.4
 Flask-Sitemap==0.4.0
-Flask-SQLAlchemy==2.5.1
+Flask-SQLAlchemy==3.0.3
 Flask-WTF==1.1.1
 future==0.18.3
 gunicorn==20.1.0