Bump tox from 4.16.0 to 4.18.0 (#175)

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

requirements-dev.txt

@@ -7,6 +7,6 @@ pre-commit==3.8.0
 pygments==2.18.0
 pyupgrade==3.17.0
 sphinx==7.0.1
-tox==4.16.0
+tox==4.18.0
 types-requests==2.32.0.20240712
 types-setuptools==71.1.0.20240726