[serve][python3.11] Use tasks/futures for asyncio.wait (#31608)

In Python 3.11, coroutines are no longer allowed in `asyncio.wait`. Need to pass in a task instead.

python/ray/serve/_private/http_proxy.py

@@ -421,11 +421,12 @@ async def ready(self):
         """Returns when HTTP proxy is ready to serve traffic.
         Or throw exception when it is not able to serve traffic.
         """
+        setup_task = get_or_create_event_loop().create_task(self.setup_complete.wait())
         done_set, _ = await asyncio.wait(
             [
                 # Either the HTTP setup has completed.
                 # The event is set inside self.run.
-                self.setup_complete.wait(),
+                setup_task,
                 # Or self.run errored.
                 self.running_task,
             ],