fix comsume_all when catch TimeoutError

Author: dongruixiao

src/a2a/server/events/event_consumer.py

@@ -130,6 +130,9 @@ async def consume_all(self) -> AsyncGenerator[Event]:
             except TimeoutError:
                 # continue polling until there is a final event
                 continue
+            except asyncio.TimeoutError:
++               # This class was made an alias of build-in TimeoutError after 3.11
++               continue
             except QueueClosed:
                 # Confirm that the queue is closed, e.g. we aren't on
                 # python 3.12 and get a queue empty error on an open queue