Add get_context methods to asyncio in 3.12 (#10534)

stdlib/asyncio/events.pyi

@@ -76,6 +76,8 @@ class Handle:
     def cancel(self) -> None: ...
     def _run(self) -> None: ...
     def cancelled(self) -> bool: ...
+    if sys.version_info >= (3, 12):
+        def get_context(self) -> Context: ...
 
 class TimerHandle(Handle):
     def __init__(