Bump tox from 4.16.0 to 4.18.0

Bumps [tox](https://github.com/tox-dev/tox) from 4.16.0 to 4.18.0.
- [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@4.16.0...4.18.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements_test.txt

@@ -6,6 +6,6 @@ pytest-cov==5.0.0
 pytest-sugar==1.0.0
 pytest-timeout==2.3.1
 ruff==0.6.3
-tox==4.16.0
+tox==4.18.0
 restructuredtext-lint==1.4.0
 pygments==2.18.0