fix: file collection after deprecation of 'py' in pytest

pytest-molecule suffers from one of the [deprecations](https://docs.pytest.org/en/7.0.x/changelog.html#id20):

- pytest-dev/pytest#7259
- https://docs.pytest.org/en/latest/deprecations.html#fspath-argument-for-node-constructors-replaced-with-pathlib-path
- https://docs.pytest.org/en/7.0.x/deprecations.html#legacy-path-hooks-deprecated

setup.cfg

@@ -71,6 +71,7 @@ install_requires =
     molecule>=3.1.0
     molecule>=3.5.2; python_version>='3.10'
     pytest-html
+    pytest>=7.0.0
 
 [options.extras_require]
 ansi =