Bump tox from 4.0.15 to 4.0.18

Bumps [tox](https://github.com/tox-dev/tox) from 4.0.15 to 4.0.18.
- [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@4.0.15...4.0.18)

---
updated-dependencies:
- dependency-name: tox
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

setup.py

@@ -59,7 +59,7 @@
             "pytest<7.3",
             "pytest-cov==4.0.0",
             "testfixtures==7.0.4",
-            "tox==4.0.15",
+            "tox==4.0.18",
             "flake8==6.0.0",
             "flake8-docstrings==1.6.0",
             "aioresponses==0.7.4",