benchmark: update iterations in benchmark/util/format.js

Fixes: #50571
PR-URL: #50932
Refs: #50571
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

Author: Lei Shi

benchmark/util/format.js

@@ -18,7 +18,7 @@ const inputs = {
 };
 
 const bench = common.createBenchmark(main, {
-  n: [1e5],
+  n: [1e6],
   type: Object.keys(inputs),
 });