chore: migrate to node test runner

[ilteoood]

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

• migrated to node test runner

• removed semver dep, as not used anymore (the plugin always target node >= v20)

• use fetch instead of http

[Fdawgs]

Thanks @ilteoood, as noted in fastify/fastify-static#495, can you use c8 please?

[ilteoood]

Thanks @ilteoood, as noted in fastify/fastify-static#495, can you use c8 please?

Sure thing, done