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MINOR: [C++] Replace std::random_shuffle with std::shuffle (#13948)

`std::random_shuffle` was deprecated in C++14 and removed altogether in C++17 in favor of `std::shuffle`. The codebase only uses these shuffling functions in tests and benchmarks and `std::shuffle` is used in all instances except this one.

Authored-by: Bryce Mecum <petridish@gmail.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>