test: investigate cudf failure in explode_test

[MarcoGorelli]

here's what the traceback shows

____________ test_explode_invalid_operation_error[cudf_constructor] ____________

request = <FixtureRequest for <Function test_explode_invalid_operation_error[cudf_constructor]>>
constructor = <function cudf_constructor at 0x7c284b3d2680>

    def test_explode_invalid_operation_error(
        request: pytest.FixtureRequest, constructor: Constructor
    ) -> None:
        if "dask" in str(constructor) or "pyarrow_table" in str(constructor):
            request.applymarker(pytest.mark.xfail)
    
        if "polars" in str(constructor) and POLARS_VERSION < (0, 20, 6):
            request.applymarker(pytest.mark.xfail)
    
        with pytest.raises(
            (InvalidOperationError, PlInvalidOperationError),
            match="`explode` operation not supported for dtype",
        ):
>           _ = nw.from_native(constructor(data)).lazy().explode("a").collect()

tests/frame/explode_test.py:146: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
narwhals/dataframe.py:5045: in explode
    return super().explode(columns, *more_columns)
narwhals/dataframe.py:342: in explode
    self._compliant_frame.explode(
narwhals/_pandas_like/dataframe.py:972: in explode
    schema = self.collect_schema()
narwhals/_pandas_like/dataframe.py:339: in collect_schema
    return self.schema
narwhals/_pandas_like/dataframe.py:331: in schema
    return {
narwhals/_pandas_like/dataframe.py:332: in <dictcomp>
    col: native_to_narwhals_dtype(
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

native_column = 0    [1, 2]
1      None
2    [None]
3        []
Name: l1, dtype: list
version = <Version.V1: 1>, implementation = <Implementation.CUDF: 3>

    def native_to_narwhals_dtype(
        native_column: Any, version: Version, implementation: Implementation
    ) -> DType:
        dtype = str(native_column.dtype)
    
        dtypes = import_dtypes_module(version)
    
        if dtype.startswith(("large_list", "list", "struct", "fixed_size_list")):
>           return arrow_native_to_narwhals_dtype(native_column.dtype.pyarrow_dtype, version)
E           AttributeError: 'ListDtype' object has no attribute 'pyarrow_dtype'

narwhals/_pandas_like/utils.py:449: AttributeError