Adapt import of check_X_y to comply with scikit-learn 1.6

[kklein]

We used to import check_X_y and check_array from sklearn.base. Since PR 29696 -- released in version 1.6.0 -- these function are no longer available in sklearn.base, but rather only in sklearn.utils.

Checklist

• Added a CHANGELOG.rst entry

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.74%. Comparing base (8b371de) to head (41c4189).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #96   +/-   ##
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  Coverage   94.73%   94.74%           
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  Files          15       15           
  Lines        1806     1807    +1     
=======================================
+ Hits         1711     1712    +1     
  Misses         95       95           

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