Fix random lint

tests/server_notices/test_resource_limits_server_notices.py

@@ -89,7 +89,7 @@ def prepare(self, reactor: MemoryReactor, clock: Clock, hs: HomeServer) -> None:
             return_value="!something:localhost"
         )
         self._rlsn._store.add_tag_to_room = AsyncMock(return_value=None)  # type: ignore[method-assign]
-        self._rlsn._store.get_tags_for_room = AsyncMock(return_value={})  # type: ignore[method-assign]
+        self._rlsn._store.get_tags_for_room = AsyncMock(return_value={})
 
     @override_config({"hs_disabled": True})
     def test_maybe_send_server_notice_disabled_hs(self) -> None: