Silence basedpyright unused-param warnings on stub_breakpointhook

Author: elidlocke

tests/worker/test_breakpoint_hang.py

@@ -114,7 +114,7 @@ async def test_breakpoint_works_in_sandboxed_workflow_in_debug_mode(client: Clie
     """
     captured: dict[str, object] = {}
 
-    def stub_breakpointhook(*args: object, **kwargs: object) -> None:
+    def stub_breakpointhook(*_args: object, **_kwargs: object) -> None:
         captured["thread"] = threading.current_thread().name
         captured["called"] = True