[Backend Dependencies Update] Update flask-httpauth to 4.0.0

[pyup-bot]

This PR updates Flask-HTTPAuth from 3.3.0 to 4.0.0.

Changelog

4.0.0

- Return user object from verify callbacks ([commit](https://github.com/miguelgrinberg/Flask-HTTPAuth/commit/51748c24f5aa53175b0f2712b814f7ea581f04e4))
- New role authorization support ([commit](https://github.com/miguelgrinberg/Flask-HTTPAuth/commit/8178f6dd74dab47b993ba532dd12f0cfdb5799f1)) (thanks **gemerden**!)
- Add a custom token authorization header option ([commit](https://github.com/miguelgrinberg/Flask-HTTPAuth/commit/575b46ade7188152e1b82de84be949bf3f8a300b)) (thanks **Mohamed Feddad**!)
- Support an optional=True argument in `login_required` decorator ([commit](https://github.com/miguelgrinberg/Flask-HTTPAuth/commit/8ecbb1157822360f5bdb24231fd50f25a6247620))
- Pass HTTP status code to error callback ([commit](https://github.com/miguelgrinberg/Flask-HTTPAuth/commit/fc8bcd6772b53ef5cc14cd4c6199d63cd2c71f30))
- More secure example of basic auth in the documentation ([commit](https://github.com/miguelgrinberg/Flask-HTTPAuth/commit/0043e138cd99c7e9fa179ee30ad2283f9b8c704f))
- Fix broken links in CHANGES.md and changelog template [85](https://github.com/miguelgrinberg/Flask-HTTPAuth/issues/85) These were pointing at https://github.com/miguelgrinberg/flask-socketio instead of https://github.com/miguelgrinberg/Flask-HTTPAuth ([commit](https://github.com/miguelgrinberg/Flask-HTTPAuth/commit/96fafd43c2d0275f2d4042e95faefce24183ec02)) (thanks **Katie Smith**!)

Links

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

[pyup-bot]

Closing this in favor of #858