Add loop_factory argument to asyncio.run on 3.12+ (#9354)

Author: FasterSpeeding

stdlib/asyncio/runners.pyi

@@ -21,7 +21,12 @@ if sys.version_info >= (3, 11):
         def get_loop(self) -> AbstractEventLoop: ...
         def run(self, coro: Coroutine[Any, Any, _T], *, context: Context | None = ...) -> _T: ...
 
-if sys.version_info >= (3, 8):
+if sys.version_info >= (3, 12):
+    def run(
+        main: Coroutine[Any, Any, _T], *, debug: bool | None = ..., loop_factory: Callable[[], AbstractEventLoop] | None = ...
+    ) -> _T: ...
+
+elif sys.version_info >= (3, 8):
     def run(main: Coroutine[Any, Any, _T], *, debug: bool | None = ...) -> _T: ...
 
 else: