asyncio: fix task factory types (#11993)

stdlib/@tests/test_cases/asyncio/check_task_factory.py

@@ -0,0 +1,13 @@
+import asyncio
+import sys
+
+
+def get_set(loop: asyncio.BaseEventLoop) -> None:
+    loop.set_task_factory(loop.get_task_factory())
+
+
+if sys.version_info >= (3, 12):
+
+    def eager(loop: asyncio.BaseEventLoop) -> None:
+        loop.set_task_factory(asyncio.eager_task_factory)
+        loop.set_task_factory(asyncio.create_eager_task_factory(asyncio.Task))