test: fix port in net-perf_hooks

PR-URL: #42761
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-net-perf_hooks.js

@@ -22,7 +22,7 @@ obs.observe({ type: 'net' });
     socket.destroy();
   }));
 
-  server.listen(8080, common.mustCall(async () => {
+  server.listen(0, common.mustCall(async () => {
     await new Promise((resolve, reject) => {
       const socket = net.connect(server.address().port);
       socket.on('end', resolve);