Replace deprecated `cupyx.scatter_max` and `cupyx.scatter_add` with `cupy.maximum.at` and `cupy.add.at`

[Matthew Roeschke]

There are 3 usages of these methods in https://github.com/rapidsai/cuml/blob/branch-24.06/python/cuml/naive_bayes/naive_bayes.py

cuml/python/cuml/naive_bayes/naive_bayes.py

Line 1882 in 89d5371

 cupyx.scatter_max( 

cuml/python/cuml/naive_bayes/naive_bayes.py

Line 1900 in 89d5371

 cupyx.scatter_max(highest_feature, indices[0], indices[2]) 

cuml/python/cuml/naive_bayes/naive_bayes.py

Line 1951 in 89d5371

 cupyx.scatter_add(jll[:, i], X.row, jll_data) 

cupy recommends this being replaced by cupy.maximum.at and cupy.add.at.