Companion #9019 (max rpc payload override) (#3276)

* Companion #9019 (max rpc payload override)

* update Substrate

Co-authored-by: parity-processbot <>

polkadot/node/test/service/src/lib.rs

@@ -188,6 +188,7 @@ pub fn node_config(
 		rpc_ws_max_connections: None,
 		rpc_cors: None,
 		rpc_methods: Default::default(),
+		rpc_max_payload: None,
 		prometheus_config: None,
 		telemetry_endpoints: None,
 		telemetry_external_transport: None,