test: fix test-benchmark-streams

test-benchmark-streams is currently failing because the `sync` option is
not specified in the test, resulting in too many benchmarks running.

PR-URL: #30757
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/benchmark/test-benchmark-streams.js

@@ -7,7 +7,8 @@ const runBenchmark = require('../common/benchmark');
 runBenchmark('streams',
              [
                'kind=duplex',
+               'n=1',
+               'sync=no',
                'type=buffer',
-               'n=1'
              ],
              { NODEJS_BENCHMARK_ZERO_ALLOWED: 1 });