[3.13] gh-136447: Use self.loop instead of global loop variable in asyncio REPL (GH-136448) (#136457)

gh-136447: Use `self.loop` instead of global `loop` variable in asyncio REPL (GH-136448)
(cherry picked from commit 77fa7a4dcc)

Co-authored-by: Justin Su <injustsu@gmail.com>

Lib/asyncio/__main__.py

@@ -62,7 +62,7 @@ def callback():
             except BaseException as exc:
                 future.set_exception(exc)
 
-        loop.call_soon_threadsafe(callback, context=self.context)
+        self.loop.call_soon_threadsafe(callback, context=self.context)
 
         try:
             return future.result()