Bump tox from 4.18.0 to 4.21.2

Bumps [tox](https://github.com/tox-dev/tox) from 4.18.0 to 4.21.2.
- [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@4.18.0...4.21.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

poetry.lock

@@ -34,7 +34,7 @@ tox-docker = "5.0.0"
 pre-commit = "^3.5.0"
 bumpversion = "^0.6.0"
 requests = "2.32.3"
-tox = "^4.18.0"
+tox = "^4.21.2"
 
 [build-system]
 requires = ["poetry-core>=1.0.0"]