[libc++] P3372R3: constexpr `queue`

[frederick-vs-ja]

Make queue constexpr as part of P3372R3.

Feature-test macro (also covers constexpr priority_queue):

#define __cpp_lib_constexpr_queue 202502L // also in <queue>

[H-G-Hristov]

This depends on constexpr deque #128656, which depends on #136067. I'm working on it.