Update Unit Tests for Pandas versions > 2

[f-allian]

• Separate PR for updating the surrogate test suite for pandas versions > 2. Closes issue Causal surrogate tests are not failing #285

[github-actions]

🦙 MegaLinter status: ⚠️ WARNING

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
⚠️ PYTHON	black	29		1	1.19s
✅ PYTHON	pylint	29		0	4.13s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.61%. Comparing base (9ed11d1) to head (f77a45c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #287      +/-   ##
==========================================
+ Coverage   95.60%   95.61%   +0.01%     
==========================================
  Files          22       22              
  Lines        1524     1529       +5     
==========================================
+ Hits         1457     1462       +5     
  Misses         67       67              

Files	Coverage Δ
...sal_testing/surrogate/causal_surrogate_assisted.py	100.00% <100.00%> (ø)

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