Update watchfiles to 0.22.0

[pyup-bot]

This PR updates watchfiles from 0.21.0 to 0.22.0.

Changelog

0.22.0

What's Changed
* fix `list-pypi-files` CI task by samuelcolvin in https://github.com/samuelcolvin/watchfiles/pull/250
* pip show wrong homepage by NewUserHa in https://github.com/samuelcolvin/watchfiles/pull/253
* Update PyO3 by mgorny in https://github.com/samuelcolvin/watchfiles/pull/267
* Delete setup.py by samuelcolvin in https://github.com/samuelcolvin/watchfiles/pull/260
* really drop python<=3.7 support by kloczek in https://github.com/samuelcolvin/watchfiles/pull/264
* uprev pyo3 and minimum rust version by samuelcolvin in https://github.com/samuelcolvin/watchfiles/pull/269
* drop black and isort by samuelcolvin in https://github.com/samuelcolvin/watchfiles/pull/270
* pre-commit block main - related to `notify` update by samuelcolvin in https://github.com/samuelcolvin/watchfiles/pull/272
* Bump idna from 3.3 to 3.7 in /requirements by dependabot in https://github.com/samuelcolvin/watchfiles/pull/271
* uprev linting, testing and docs requirements by samuelcolvin in https://github.com/samuelcolvin/watchfiles/pull/273

New Contributors
* NewUserHa made their first contribution in https://github.com/samuelcolvin/watchfiles/pull/253
* kloczek made their first contribution in https://github.com/samuelcolvin/watchfiles/pull/264

**Full Changelog**: https://github.com/samuelcolvin/watchfiles/compare/v0.21.0...v0.22.0

Links

• PyPI: https://pypi.org/project/watchfiles
• Changelog: https://data.safetycli.com/changelogs/watchfiles/
• Repo: https://github.com/samuelcolvin/watchfiles

[browniebroke]

We've just downgraded it: #5243