Backport PR #44839 on branch 1.4.x (REGR: allow reindexing datetimelike with upcast / raise deprecation warning)
Backport PR #44839: REGR: allow reindexing datetimelike with upcast / raise deprecation warning
restarted failing tests. 

pandas-dev.pandas (Windows py38_np18_2) failed on second attempt. timeout

Posix / pytest (actions-38-minimum_versions.yaml, not slow and not ne... failed on different test but with same ResourceWarning

1st attempt FAILED pandas/tests/io/formats/style/test_deprecated.py::test_hide_index_columns[index]
2nd attempt FAILED pandas/tests/io/formats/style/test_deprecated.py::test_where_subset[slice_4]

Will assume unrelated to this PR and merge.