flask was recently updated to it's latest version 3.0.1, which in turn
breaks the override for flask-sqlalchemy 2.5.1, as this requires flask
2.x.
At the end, this then breaks (building) sourcehut.
Fixes: a24d9a6a54 ("python311Packages.flask: 2.3.3 -> 3.0.1")
Signed-off-by: Christoph Heiss <christoph@c8h4.io>