Don't cancel wait_readable()

Author: davidbrochart

src/zmq_anyio/_socket.py

@@ -906,8 +906,7 @@ async def _start(self, *, task_status: TaskStatus[None] = TASK_STATUS_IGNORED):
                 done, pending = await wait(
                     tasks, self._task_group, return_when=FIRST_COMPLETED
                 )
-                for task in pending:
-                    task.cancel()
+                wait_readable.cancel()
                 if wait_stopped_task in done:
                     break
                 await self._handle_events()