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

[mroeschke]

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.