fix(polars): add workaround to compile Array<Array> correctly #9484
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NickCrews
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Workaround for pola-rs/polars#17294
pl.concat_list(Iterable[T]) results in pl.List[T], EXCEPT when T is a
pl.List, in which case pl.concat_list(Iterable[pl.List[T]]) results in pl.List[T].
If polars ever supports a more consistent array constructor,
we should switch to that.
Found this when working on #9473