Bump tox from 4.5.2 to 4.6.0 in /requirements (jazzband#1184)

Bumps [tox](https://github.com/tox-dev/tox) from 4.5.2 to 4.6.0.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/main/docs/changelog.rst)
- [Commits](tox-dev/tox@4.5.2...4.6.0)

---
updated-dependencies:
- dependency-name: tox
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/tox.txt

@@ -1,3 +1,3 @@
 -r ./coverage.txt
-tox==4.5.2
+tox==4.6.0
 tox-gh-actions==3.1.1