benchmark: increase the iteration number to an appropriate value

Current iteration number is too small that fwrite occupies large
portion of execution time which made crypo execution time measured
inaccurate. The iteration above 1e5 makes 50% higher and stable
score.

PR-URL: https://github.com/nodejs/node/pull/50766
Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>

benchmark/crypto/webcrypto-digest.js

@@ -8,7 +8,7 @@ const bench = common.createBenchmark(main, {
   sync: ['createHash', 'subtle'],
   data: [10, 20, 50, 100],
   method: ['SHA-1', 'SHA-256', 'SHA-384', 'SHA-512'],
-  n: [1e3],
+  n: [1e5],
 });
 
 const kMethods = {