remove filterwarning about UnboundedQueue

Author: graingert

src/trio/_core/_tests/test_io.py

@@ -384,7 +384,6 @@ def check(*, expected_readers: int, expected_writers: int) -> None:
         check(expected_readers=1, expected_writers=0)
 
 
-@pytest.mark.filterwarnings("ignore:.*UnboundedQueue:trio.TrioDeprecationWarning")
 async def test_io_manager_kqueue_monitors_statistics() -> None:
     def check(
         *,