[issue23565] local_clear walks the list of threads without holding head_lock.

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[issue23565] local_clear walks the list of threads without holding head_lock.

New submission from Daniel Stutzbach: local_clear in _threadmodule.c walks the list of threads without holding head_mutex. Since the list of threads can change when holding only head_mutex and not on the GIL, the list can change while local_clear is executing, which may cause Bad Things to ha