Update csv_stack test for pandas >= 2.1 #653
Merged
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Resolves #634
Pandas 2 preserves the column ordering now, presumably as a bug fix, so have adapted to the test to not expect the old column ordering. The ordering will remain different from Python 3.8 because this change occurred between Pandas 2.0.3 and later versions (2.1, 2.2). I could not find the exact Pandas issue.