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5aaa30b267
std::rel_ops was deprecated in C++20, as C++20 provides a better solution for defining comparison operators. and all the use cases previously to be addressed by `using namespace std::rel_ops` have been addressed either by `operator<=>` or the default-generated `operator!=`. so, in this series, to avoid using deprecated facilities, let's drop all these `using namespace std::rel_ops`. there are many more cases where we could either use `operator<=>` or the default-generated `operator!=` to simplify the implementation. but here, we care more about `std::rel_ops`, we will drop the most (if not all of them) of the explicitly defined `operator!=` and other comparison operators later. Closes #13676 * github.com:scylladb/scylladb: treewide: do not use std::rel_ops dht: token: s/tri_compare/operator<=>/