Update _thread.pyi for Python3.12 (#10285)

stdlib/_thread.pyi

@@ -43,3 +43,6 @@ if sys.version_info >= (3, 8):
         @property
         def thread(self) -> Thread | None: ...
     _excepthook: Callable[[_ExceptHookArgs], Any]
+
+if sys.version_info >= (3, 12):
+    def daemon_threads_allowed() -> bool: ...

tests/stubtest_allowlists/py312.txt

@@ -1,6 +1,5 @@
 # Uncategorised, from Python 3.12
 _ctypes.SIZEOF_TIME_T
-_thread.daemon_threads_allowed
 argparse.BooleanOptionalAction.__init__
 array.array.__class_getitem__
 asyncio.BaseEventLoop.create_connection