Bumps [tox](https://github.com/tox-dev/tox) from 3.21.4 to 3.22.0.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/3.22.0/docs/changelog.rst)
- [Commits](https://github.com/tox-dev/tox/compare/3.21.4...3.22.0

)

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