Fix compiler warning about signed vs unsigned ints

[hcho3]

src/cpp/src/fil/treelite_import.cu:496:26: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'const int' [-Wsign-compare]
103.2   496 |     ASSERT(leaf_vec_size == model.num_class[0], "treelite model inconsistent");
103.2       |           ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
103.2 /rapids_triton/build/_deps/cuml-src/cpp/src/fil/treelite_import.cu:516:40: warning: comparison of integer expressions of different signedness: 'const int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare]
103.2   516 |         ASSERT(model.class_id[tree_id] == tree_id % static_cast<size_t>(model.num_class[0]),
103.2       |           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[codecov-commenter]

Codecov Report

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Additional details and impacted files

@@               Coverage Diff               @@
##             branch-24.10    #6053   +/-   ##
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  Coverage                ?   67.06%           
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  Files                   ?      195           
  Lines                   ?    12920           
  Branches                ?        0           
===============================================
  Hits                    ?     8665           
  Misses                  ?     4255           
  Partials                ?        0           

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[divyegala]

/merge