Fix exception

Author: blast-hardcheese

replit_river/client_session.py

@@ -64,7 +64,7 @@ async def send_rpc(
             try:
                 async with asyncio.timeout(int(timeout.total_seconds())):
                     response = await output.get()
-            except asyncio.CancelledError as e:
+            except asyncio.TimeoutError as e:
                 # TODO(dstewart) After protocol v2, change this to STREAM_CANCEL_BIT
                 await self.send_message(
                     stream_id=stream_id,