Update tox requirement from ==4.21.* to ==4.22.*

Updates the requirements on [tox](https://github.com/tox-dev/tox) to permit the latest version.
- [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...4.22.0)

---
updated-dependencies:
- dependency-name: tox
  dependency-type: direct:production
...

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

requirements-test.txt

@@ -1,4 +1,4 @@
 coverage == 7.6.*
 pre-commit == 4.0.*
 psycopg2-binary == 2.9.*
-tox == 4.21.*
+tox == 4.22.*