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Joris Van den Bossche authored and GitHub committed 370818ae884
GH-41978: [Python] Fix pandas tests to follow downstream datetime64 unit changes (#41979) ### Rationale for this change Pandas changed the default unit used in certain cases for the `datetime64[unit]` dtype. This causes some failures in our test suite when tested with pandas 3.0.0.dev * GitHub Issue: #41978 Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com> Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>