make pylint happy

Author: bisgaard-itis

services/web/server/src/simcore_service_webserver/functions/_controller_rpc.py

@@ -10,7 +10,7 @@
 
 
 @router.expose()
-async def ping(app) -> str:
+async def ping(app) -> str:  # pylint: disable=unused-argument
     return "pong from webserver"