Update flask_httpauth to 4.8.1

[pyup-bot]

This PR updates flask_httpauth from 4.5.0 to 4.8.1.

Changelog

4.8.1

- Do not accept empty or missing tokens ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/b15ffe9e50e110d7174ccd944f642079e1dcf9ee))
- New installation section in the documentation ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/0fbd469824e478d2bf62382a172e01dc2302658e))
- Revised documentation ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/3c8f3bac9e86368d7a86c94194c835244ce566c3))
- Fix documentation links [163](https://github.com/miguelgrinberg/flask-httpauth/issues/163) ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/36e85e825bd989838d5bf90818184eacd9e4be1a)) (thanks **Ofer Nave**!)
- Code modernization ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/bc689124a25960f6e481ea308d3ccf03bbfaec5e))

4.8.0

- Changes to handle breaking changes in Flask/Werkzeug 2.3 [160](https://github.com/miguelgrinberg/flask-httpauth/issues/160) ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/76548398847fcedc8421a8f4b4c2d12ee16270fe))
- Remove Python 3.6 and 3.7 from builds, add Python 3.11 ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/04399bd2e121f8f0bff34360af74978920ba9096))
- Replace itsdangerous with pyjwt in examples [157](https://github.com/miguelgrinberg/flask-httpauth/issues/157) ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/6f708b09f4d54e48ef1a3501c63867ffb1789077))
- Better documentation for the `get_user_roles` callback argument [152](https://github.com/miguelgrinberg/flask-httpauth/issues/152) ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/03ff9443114ac57cae34dcf0aae39e89985529b0)) (thanks **Taranjeet Singh**!)

4.7.0

- Fallback to latin-1 encoding for credentials when utf-8 fails [151](https://github.com/miguelgrinberg/flask-httpauth/issues/151) ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/4a92b75b79ea8e29ed76910792208d0a0a9e897a))
- Documentation updates ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/b42168ed174cde0a9404dbf0b05b5b5c5d6eb46d))

4.6.0

- Add MD5-Sess algorithm for Digest auth ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/8a5d1eb87c9b3cb71cc6c5839a4a3411ede1f505))
- Add qop=auth option for Digest auth ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/d311fe5e996d43316989daf8a67ded22a6a567e2)) (thanks **Edward**!)
- Add Python 3.10 and PyPy 3.8 to build ([commit](https://github.com/miguelgrinberg/flask-httpauth/commit/ffeab170a8230e4defb117f242937865072c8094))

Links

• PyPI: https://pypi.org/project/flask-httpauth
• Changelog: https://data.safetycli.com/changelogs/flask-httpauth/
• Docs: https://pythonhosted.org/Flask-HTTPAuth/