Match pandas reverting apply deprecation

[jrbourbeau]

pandas recently reverted this deprecations (xref pandas-dev/pandas#55189). We do the same thing here to match behavior with pandas and fix test that are currently failing in CI

cc @phofl

[jrbourbeau]

Okay, it looks like

FAILED dask/dataframe/tests/test_merge_column_and_index.py::test_merge_column_with_nulls[None]
FAILED dask/dataframe/tests/test_merge_column_and_index.py::test_merge_column_with_nulls[4]
FAILED dask/dataframe/tests/test_multi.py::test_join_by_index_patterns[disk-left]
FAILED dask/dataframe/tests/test_multi.py::test_join_by_index_patterns[tasks-right]
FAILED dask/dataframe/tests/test_multi.py::test_join_by_index_patterns[tasks-left]
FAILED dask/dataframe/tests/test_multi.py::test_join_by_index_patterns[disk-right]

are still failing on pandas=2.1.1 (I thought there was just an upstream issue only on 2.1.0). Let's go ahead and continue to skip these tests for now. This definitely isn't ideal, but also isn't any worse than what we currently have on main. @phofl do you know why these are still failing? (xref #10488)

[jrbourbeau]

I'll go ahead and merge this PR in as I think it's pretty uncontroversial and also unblocks CI for others. I'm happy to follow-up if folks have feedback

[phofl]

change is good, the deprecation was bad and shouldn't have been merged

Not clue why the merge tests are still broken, will take a look