Bump tox from 4.11.3 to 4.15.0 (kubernetes-sigs#11133)

Bumps [tox](https://github.com/tox-dev/tox) from 4.11.3 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@4.11.3...4.15.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

tests/requirements.txt

@@ -7,6 +7,6 @@ molecule==6.0.2
 molecule-plugins[vagrant]==23.5.0
 python-vagrant==1.0.0
 pytest-testinfra==9.0.0
-tox==4.11.3
+tox==4.15.0
 yamllint==1.32.0
 tzdata==2023.3