Bump tox from 4.6.4 to 4.15.0

Bumps [tox](https://github.com/tox-dev/tox) from 4.6.4 to 4.15.0.
- [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@4.6.4...4.15.0)

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

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

requirements-dev.txt

@@ -1,5 +1,5 @@
 -r requirements.txt
-tox==4.6.4
+tox==4.15.0
 black==23.10.1
 pylint==2.9.6
 SaltPylint==2023.8.3