KokkosSparse_par_ilut_numeric_impl.hpp: use capture by reference

Resolve warnings in builds with c++20 support enabled:
"kokkos-kernels/sparse/impl/KokkosSparse_par_ilut_numeric_impl.hpp(591):
warning #2908-D: the implicit by-copy capture of "this" is deprecated"

sparse/impl/KokkosSparse_par_ilut_numeric_impl.hpp

@@ -588,7 +588,7 @@ struct IlutWrap {
           count);
 
       Kokkos::single(Kokkos::PerTeam(team),
-                     [=]() { O_row_map(row_idx) = count; });
+                     [&]() { O_row_map(row_idx) = count; });
     }
 
     float_t threshold;