test(sdk): give the async launch deadline slack on slow runners

macOS 3.14 CI spent 530 ms on a 400 ms budget plus process overhead.

Author: yashranaway

packages/headless-python/tests/test_lifecycle.py

@@ -479,8 +479,9 @@ async def scenario() -> None:
                     HEADLESS_TEST_PID_FILE=str(pid_file),
                 ),
             )
-        # Cleanup has its own 100 ms budget after the single 300 ms startup budget.
-        assert time.monotonic() - started < 0.5
+        # Cleanup has its own 100 ms budget after the single 300 ms startup
+        # budget. Leave slack for slow macOS 3.14 CI runners.
+        assert time.monotonic() - started < 1.0
 
     asyncio.run(scenario())
     assert process_is_gone(int(pid_file.read_text()))