ruff upgrade

Author: theomonnom

livekit-rtc/livekit/rtc/synchronizer.py

@@ -185,9 +185,9 @@ async def wait_next_process(self) -> None:
 
     def after_process(self) -> None:
         """Update timing information after processing a frame."""
-        assert (
-            self._next_frame_time is not None
-        ), "wait_next_process must be called first"
+        assert self._next_frame_time is not None, (
+            "wait_next_process must be called first"
+        )
 
         # update timing information
         self._send_timestamps.append(time.perf_counter())