benchmark: update iterations in benchmark/crypto/aes-gcm-throughput.js

Fixes: #50571
PR-URL: #50929
Refs: #50571
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: James M Snell <jasnell@gmail.com>

benchmark/crypto/aes-gcm-throughput.js

@@ -3,7 +3,7 @@ const common = require('../common.js');
 const crypto = require('crypto');
 const keylen = { 'aes-128-gcm': 16, 'aes-192-gcm': 24, 'aes-256-gcm': 32 };
 const bench = common.createBenchmark(main, {
-  n: [500],
+  n: [2500],
   cipher: ['aes-128-gcm', 'aes-192-gcm', 'aes-256-gcm'],
   len: [1024, 4 * 1024, 16 * 1024, 64 * 1024, 256 * 1024, 1024 * 1024],
 });