Amaury Forgeot d'Arc

`pytest.warns(None)` fails with pytest version 8.0: https://docs.pytest.org/en/stable/deprecations.html#using-pytest-warns-none ``` $ pytest tests/embed/test_mcca.py ===================================================================== test session starts ===================================================================== platform linux -- Python 3.11.2, pytest-8.3.4, pluggy-1.5.0 rootdir: /home/amauryfa/dev/mvlearn configfile: pytest.ini plugins: cov-6.0.0 collected...