Python dependency: Update flask-socketio requirement in /web/regression

Updates the requirements on [flask-socketio](https://github.com/miguelgrinberg/flask-socketio) to permit the latest version.
- [Release notes](https://github.com/miguelgrinberg/flask-socketio/releases)
- [Changelog](https://github.com/miguelgrinberg/Flask-SocketIO/blob/main/CHANGES.md)
- [Commits](miguelgrinberg/Flask-SocketIO@v5.3.0...v5.4.1)

---
updated-dependencies:
- dependency-name: flask-socketio
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -20,7 +20,7 @@ Flask-Paranoid==0.*
 Flask-Babel==4.0.*
 Flask-Security-Too==5.5.*; python_version >= '3.10'
 Flask-Security-Too==5.4.*; python_version <= '3.9'
-Flask-SocketIO==5.3.*
+Flask-SocketIO==5.4.*
 WTForms==3.1.*
 passlib==1.*
 pytz==2024.*