benchmark: calibrate config v8/serialize.js

According to recent tests with `calibrate-n` on
a dedicated Hetzner machine (4vCPUs | 16gb) the
results got stable with n=1e5.

The work on nodejs/performance#186 (comment)
has shown this benchmark file spends 2-minutes for a single
run. This should improve things a bit.

PR-URL: #59586
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: RafaelGSS

benchmark/v8/serialize.js

@@ -4,8 +4,8 @@ const common = require('../common.js');
 const v8 = require('v8');
 
 const bench = common.createBenchmark(main, {
-  len: [256, 1024 * 16, 1024 * 512],
-  n: [1e6],
+  len: [256, 1024 * 16],
+  n: [1e5],
 });
 
 function main({ n, len }) {