benchmark: calibrate config cluster/echo.js

PR-URL: #59836
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>

Author: meteorqz6

benchmark/cluster/echo.js

@@ -8,7 +8,7 @@ if (cluster.isPrimary) {
     payload: ['string', 'object'],
     sendsPerBroadcast: [1, 10],
     serialization: ['json', 'advanced'],
-    n: [1e5],
+    n: [1e3],
   });
 
   function main({