Make it compatible with pandas 2

[artemisart]

[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

@@           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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