Bump tox from 4.17.1 to 4.18.0 (#627)

Bumps [tox](https://github.com/tox-dev/tox) from 4.17.1 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@4.17.1...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

@@ -3,6 +3,6 @@
 -r requirements_pypi.txt
 -r requirements_test.txt
 -r docs/requirements.txt
-tox==4.17.1
+tox==4.18.0
 
 -e .