Merge pull request #8244 from open-webui/dependabot/pip/backend/dev/flask-3.1.0

build(deps): bump flask from 3.0.3 to 3.1.0 in /backend

backend/requirements.txt

@@ -3,7 +3,7 @@ uvicorn[standard]==0.30.6
 pydantic==2.9.2
 python-multipart==0.0.18
 
-Flask==3.0.3
+Flask==3.1.0
 Flask-Cors==5.0.0
 
 python-socketio==5.11.3