chore: fixed type errors in xgboost.py

[eschmidt42]

This pull request makes a minor update to the way bin edges are passed to pd.cut in the xgboost.py module. The change ensures compatibility by converting numpy arrays of bin edges to Python lists before passing them to pd.cut.

• Compatibility improvements:
  • In both xgboost_histogrammify_with_h and xgboost_histogrammify_with_x_bin_edges, bin edge arrays are now converted to lists using .tolist() before being used as the bins parameter in pd.cut. [1] [2]