py-scikit-learn now requires py-narwhals, please add it to the dependency list.

This is from a system just after 'pkg install py311-scikit-learn' was run.

>>> from sklearn.linear_models import Ridge
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.11/site-packages/sklearn/__init__.py", line 70, in <module>
    from sklearn.base import clone  # noqa: E402
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/sklearn/base.py", line 20, in <module>
    from sklearn.utils._metadata_requests import _MetadataRequester, _routing_enabled
  File "/usr/local/lib/python3.11/site-packages/sklearn/utils/__init__.py", line 9, in <module>
    from sklearn.utils._chunking import gen_batches, gen_even_slices
  File "/usr/local/lib/python3.11/site-packages/sklearn/utils/_chunking.py", line 11, in <module>
    from sklearn.utils._param_validation import Interval, validate_params
  File "/usr/local/lib/python3.11/site-packages/sklearn/utils/_param_validation.py", line 17, in <module>
    from sklearn.utils.validation import _is_arraylike_not_scalar
  File "/usr/local/lib/python3.11/site-packages/sklearn/utils/validation.py", line 14, in <module>
    import narwhals.stable.v2 as nw