MAINT: replace PyThread_type_lock with PyMutex on Python >= 3.13.0b3 #27011
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PyMutex is available in the public C API starting in 3.13.0b3 which our CI should be running.
My understanding is that PyMutex is faster than PyThread_type_lock in all cases and that it should be used whenever it's available instead of PyThread_type_lock.
There's one usage inside a
Py_GIL_DISABLEDblock. We now fail to compile on 3.13.0b2 and older if we don't want to keep thePyThread_type_lockcode.