Make it compatible with pandas 2

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (0513fe7) 98.12% compared to head (91c3eb5) 98.12%.

Files	Patch %	Lines
functional/test/test_functional.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #197 +/- ## ======================================= Coverage 98.12% 98.12% ======================================= Files 12 12 Lines 2350 2350 ======================================= Hits 2306 2306 Misses 44 44 ```

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