test: use common.PORT instead of hardcoded port number

PR-URL: #39298
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: Trott

Diff for: test/sequential/test-debugger-invalid-args.js

@@ -21,7 +21,7 @@ const { createServer } = require('net');
 
 // Launch w/ invalid host:port.
 {
-  const cli = startCLI(['localhost:914']);
+  const cli = startCLI([`localhost:${common.PORT}`]);
   cli.quit()
     .then((code) => {
       assert.match(