Fix deprecation warnings with is_categorical_dtype

[gsheni]

• Closes #2640

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7209f8e) 99.47% compared to head (d28f794) 99.46%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2641 +/- ## ========================================== - Coverage 99.47% 99.46% -0.01% ========================================== Files 404 404 Lines 24215 24211 -4 ========================================== - Hits 24088 24082 -6 - Misses 127 129 +2 ```

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