Merge pull request #362 from CSCfi/dependabot/pip/tox-4.0.18

Bump tox from 4.0.15 to 4.0.18

Author: github-actions[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",