Bump tox from 4.14.2 to 4.15.0 in /test

Bumps [tox](https://github.com/tox-dev/tox) from 4.14.2 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](https://github.com/tox-dev/tox/compare/4.14.2...4.15.0)

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

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

test/requirements.txt

@@ -2,5 +2,5 @@ pyyaml == 6.0.1
 pytest == 8.1.1
 pytest-xdist == 3.5.0
 pytest-testinfra == 10.1.0
-tox == 4.14.2
+tox == 4.15.0