I tried to run tests for pytest-subprocess with the pytest-relaxed installed and one test failed there with this error:
E pytest.PytestDeprecationWarning: The hookimpl pytest_configure uses old-style configuration options (marks or attributes).
E Please use the pytest.hookimpl(trylast=True) decorator instead
E to configure the hooks.
E See https://docs.pytest.org/en/latest/deprecations.html#configuring-hook-specs-impls-using-markers
E at /usr/lib/python3.9/vendor-packages/pytest_relaxed/plugin.py:40