[Backend Dependencies Update] Update flask-socketio to 5.0.3

[pyup-bot]

This PR updates flask-socketio from 4.3.2 to 5.0.3.

Changelog

5.0.3

- Document the use of simple-websocket with the development web server ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/6a2463cc21e56dfac27f63832d2510a3e1467634))
- Show transport in example apps ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/044e9c066c53c865abb1eee0e81c90a0c7022b7e))
- Added Open Collective funding option ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/ab99680cefba577b06b19227480511ad6508a1d4))

5.0.2

- Silence deprecation warning from Werkzeug 2.x [1549](https://github.com/miguelgrinberg/flask-socketio/issues/1549) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/6563634e4c7836479ff5d38d20f4339e6bcf92ab))
- Updated server options in documentation ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/6bcd1dc29d1dde4f61e582fc62f4bb752008615e))
- Updated socketio javascript client versions in documentation ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/c527c90cbe2b6f141ca94ec75964af5d0e304ab7))
- Fix typo in documentation [1524](https://github.com/miguelgrinberg/flask-socketio/issues/1524) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/2f1c322e687a8f7f080a081f042efdc6c8532123)) (thanks **lennertcl**!)
- Change room documentation from room= to to= [1519](https://github.com/miguelgrinberg/flask-socketio/issues/1519) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/b33cab093c85d4888093a9c2992eb8a815695b4d)) (thanks **David McInnis**!)
- Fixed a type in the Kafka URL in the documentation [1476](https://github.com/miguelgrinberg/flask-socketio/issues/1476) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/a222638186f57980a08d2d4e98624dd27c1e2bd3)) (thanks **VVakko**!)
- Fixed typos in documentation [1447](https://github.com/miguelgrinberg/flask-socketio/issues/1447) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/3f7ef81fee05be6b674521bd5850676bb2021897))

5.0.1

- Fix handling of  argument [1441](https://github.com/miguelgrinberg/flask-socketio/issues/1441) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/4ec274831551a3141a5838d9fd4c5e983f637a3a))
- Add python-engineio to version compatibility table ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/2934b469da80c1f5df9f560f06cf11e61dd2f1bd))
- Test client: pass packets through an encode/decode cycle [1427](https://github.com/miguelgrinberg/flask-socketio/issues/1427) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/ffe66fee0e72737aa974337a3ceaab4553ab3325))

5.0.0

- Move to python-socketio 5.x and the 3.x JavaScript releases ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/0c674b89c094f1085ad05fd7b6d2c304b9cf5791))
- Also see [python-socketio change log](https://github.com/miguelgrinberg/python-socketio/blob/master/CHANGES.md)
- Also see [python-engineio change log](https://github.com/miguelgrinberg/python-engineio/blob/master/CHANGES.md)
- add socketio.event convenience decorator ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/62717a852983bbf5d89d9b8f898282712c9bbf24))
- Rename `room`  argument to `to` ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/4c69c9a807a94120c4a07274e29ef9b9a41bfb86))
- Documentation updates ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/e864441e7ac7263d77e9a2e18863ebc22dcbf6ec)) ([commit](https://github.com/miguelgrinberg/flask-socketio/commit/c91244a30e77104c6df827b55f9dfad8ae9c7788))

Links

• PyPI: https://pypi.org/project/flask-socketio
• Changelog: https://pyup.io/changelogs/flask-socketio/
• Repo: http://github.com/miguelgrinberg/Flask-SocketIO/
• Docs: https://pythonhosted.org/Flask-SocketIO/