Block in ClientTransport.close() for safety

Author: blast-hardcheese

src/replit_river/v2/client_transport.py

@@ -50,7 +50,7 @@ async def close(self) -> None:
         """
         self._rate_limiter.close()
         if self._session:
-            self._session.close()
+            await self._session.close().wait()
 
         if self._closing_event:
             await self._closing_event[1].wait()