text: Title: pandas 2.2: changed behaviour in `test_multi.py::test_concat5`
  Body: This test has started failing when pandas got upgraded to 2.2 last weekend:
  
  ```
  FAILED dask/dataframe/tests/test_multi.py::test_concat5 - AssertionError: DataFrame are different
  
  DataFrame shape mismatch
  [left]:  (14, 6)
  [right]: (14, 5)
  ```