Bump tox from 3.18.1 to 3.19.0

Bumps [tox](https://github.com/tox-dev/tox) from 3.18.1 to 3.19.0.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/master/docs/changelog.rst)
- [Commits](https://github.com/tox-dev/tox/compare/3.18.1...3.19.0)

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