Merge pull request #222 from CSCfi/dependabot/pip/tox-4.16.0

Bump tox from 4.15.1 to 4.16.0

setup.py

@@ -17,7 +17,7 @@
     packages=find_packages(),
     include_package_data=True,
     install_requires=requirements,
-    extras_require={"test": ["coverage==7.6.0", "pytest==8.2.2", "pytest-cov==5.0.0", "tox==4.15.1"]},
+    extras_require={"test": ["coverage==7.6.0", "pytest==8.2.2", "pytest-cov==5.0.0", "tox==4.16.0"]},
     entry_points="""
         [console_scripts]
         xml-validate=validator.__main__:cli