chore(deps): bump tox from 4.21.0 to 4.21.1

Bumps [tox](https://github.com/tox-dev/tox) from 4.21.0 to 4.21.1.
- [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@4.21.0...4.21.1)

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

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

requirements.txt

@@ -2,4 +2,4 @@
 -r requirements-qa.txt
 -r requirements-test.txt
 sphinx_rtd_theme==2.0.0
-tox==4.21.0
+tox==4.21.1