perf: use node: prefix to bypass require.cache call for builtins

[Fdawgs]

See fastify/fastify-static#407

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[Uzlopak]

@gurgunday
When you merge a PR you can usually savely delete the corresponding branch. ;)

[gurgunday]

Sure thing :)

I thought it was their branch, not Fastify's