Flaky test on mindeps: test_concat_categorical #12268
Description
This test frequently fails on the mindeps-optional environment only:
https://github.com/dask/dask/actions/runs/21628536686/job/62334916047?pr=12266
FAILED dask/dataframe/tests/test_multi.py::test_concat_categorical[True-False-True] - AssertionError: Series are different
Series values are different (26.66667 %)
[index]: [0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4]
[left]: ['a', 'a', 'b', 'b', 'b', ..., 'b', 'b', 'a', 'c', 'c']
Length: 15
Categories (3, object): ['a', 'b', 'c']
[right]: ['a', 'a', 'b', 'b', 'c', ..., 'b', 'b', 'a', 'c', 'c']
Length: 15
Categories (3, object): ['a', 'b', 'c']
At positional index 4, first diff: b != c
FAILED dask/dataframe/tests/test_multi.py::test_concat_categorical[False-False-True] - AssertionError: Series are different
Series values are different (26.66667 %)
[index]: [0, 0, 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4]
[left]: ['a', 'a', 'b', 'b', 'b', ..., 'b', 'b', 'a', 'c', 'c']
Length: 15
Categories (3, object): ['a', 'b', 'c']
[right]: ['a', 'a', 'b', 'b', 'c', ..., 'b', 'b', 'a', 'c', 'c']
Length: 15
Categories (3, object): ['a', 'b', 'c']
At positional index 4, first diff: b != c