benchmark: update interations and len in benchmark/util/text-decoder.js

Fixes: #50571
PR-URL: #50938
Refs: #50571
Reviewed-By: Vinícius Lourenço Claro Cardoso <[email protected]>

Author: Lei Shi

benchmark/util/text-decoder.js

@@ -6,8 +6,8 @@ const bench = common.createBenchmark(main, {
   encoding: ['utf-8', 'latin1', 'iso-8859-3'],
   ignoreBOM: [0, 1],
   fatal: [0, 1],
-  len: [256, 1024 * 16, 1024 * 512],
-  n: [1e2],
+  len: [256, 1024 * 16, 1024 * 128],
+  n: [1e3],
   type: ['SharedArrayBuffer', 'ArrayBuffer', 'Buffer'],
 });