chore(deps): update dependency tox to v4.16.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
tox (changelog)	4.15.1 -> 4.16.0

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Release Notes

tox-dev/tox (tox)

### [`v4.16.0`](https://togithub.com/tox-dev/tox/releases/tag/4.16.0) [Compare Source](https://togithub.com/tox-dev/tox/compare/4.15.1...4.16.0) #### What's Changed - Fix two small documentation issues by [@​srenfo](https://togithub.com/srenfo) in [https://github.com/tox-dev/tox/pull/3297](https://togithub.com/tox-dev/tox/pull/3297) - Fix tests after new setuptools by [@​gaborbernat](https://togithub.com/gaborbernat) in [https://github.com/tox-dev/tox/pull/3299](https://togithub.com/tox-dev/tox/pull/3299) - Add `windir` to the default list of `pass_env` variables on Windows by [@​kurtmckee](https://togithub.com/kurtmckee) in [https://github.com/tox-dev/tox/pull/3303](https://togithub.com/tox-dev/tox/pull/3303) #### New Contributors - [@​srenfo](https://togithub.com/srenfo) made their first contribution in [https://github.com/tox-dev/tox/pull/3297](https://togithub.com/tox-dev/tox/pull/3297) **Full Changelog**: https://github.com/tox-dev/tox/compare/4.15.1...4.16.0

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Coverage report

This PR does not seem to contain any modification to coverable code.