benchmark: increase iteration number of crypto hkdf case

Increase the iteration number from 1000 to 10000 to get a reasonble
score. The updated score has up to ~60% improvement.

Fixes: nodejs#50571

Author: Lei Shi

benchmark/crypto/hkdf.js

@@ -14,7 +14,7 @@ const bench = common.createBenchmark(main, {
   salt: ['', 'salt'],
   info: ['', 'info'],
   hash: ['sha256', 'sha512'],
-  n: [1e3],
+  n: [1e4],
 });
 
 function measureSync(n, size, salt, info, hash, key) {