Bump tox from 4.14.1 to 4.21.2

Bumps [tox](https://github.com/tox-dev/tox) from 4.14.1 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@4.14.1...4.21.2)

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

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

requirements.txt

@@ -1,2 +1,2 @@
 Mastodon.py==1.8.1
-tox==4.14.1
+tox==4.21.2