build(deps-dev): 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:development
  update-type: version-update:semver-minor
...

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

requirements-dev.txt

@@ -5,5 +5,5 @@ coverage==7.6.1
 flake8==7.1.1
 pytest==8.3.2
 Sphinx==8.0.2
-tox==4.16.0
+tox==4.18.0
 twine==5.1.1