benchmark: update iterations in benchmark/util/normalize-encoding.js

Fixes: #50571
PR-URL: #50934
Refs: #50571
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

Author: Lei Shi

benchmark/util/normalize-encoding.js

@@ -21,7 +21,7 @@ const inputs = [
 
 const bench = common.createBenchmark(main, {
   input: inputs.concat(Object.keys(groupedInputs)),
-  n: [1e5],
+  n: [1e6],
 }, {
   flags: '--expose-internals',
 });