chore(op): Clean up SupervisorClient (#16079)

crates/optimism/node/src/node.rs

@@ -562,8 +562,10 @@ where
                 "Default supervisor url is used, consider changing --rollup.supervisor-http."
             );
         }
-        let supervisor_client =
-            SupervisorClient::new(self.supervisor_http.clone(), self.supervisor_safety_level).await;
+        let supervisor_client = SupervisorClient::builder(self.supervisor_http.clone())
+            .minimum_safety(self.supervisor_safety_level)
+            .build()
+            .await;
 
         let validator = TransactionValidationTaskExecutor::eth_builder(ctx.provider().clone())
             .no_eip4844()