benchmark: remove punycode from require-builtins fixture

It's now runtime-deprecated. Remove it from the benchmark. This
also gets rid of the warning emitted when the fixture is loaded.

PR-URL: #50689
Reviewed-By: Yagiz Nizipli <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>

Author: joyeecheung

benchmark/fixtures/require-builtins.js

@@ -23,7 +23,6 @@ const list = [
   'path',
   'perf_hooks',
   'process',
-  'punycode',
   'querystring',
   'readline',
   'repl',