test: reduce duration in misc benchmark

PR-URL: #20125
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>

Author: apapirovski

test/parallel/test-benchmark-misc.js

@@ -6,6 +6,7 @@ const runBenchmark = require('../common/benchmark');
 
 runBenchmark('misc', [
   'concat=0',
+  'dur=0.1',
   'method=',
   'n=1',
   'type=extend',