fix unit tests, replace pem with self-cert

[Uzlopak]

We dont need to make big changes, to get the unit tests running again. Created a RSA private key and just supply it to pem, avoiding to make big refactoring.

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]

strange. locally it runs?!

[Uzlopak]

OK, replaced pem with self-cert. First replaced it with selfsigned, but then I realized that self-cert is made by @jsumners so I use that instead.

[jsumners]

For what it's worth, I don't care which one is used as long as it works. But I was planning to point out fastify/fastify#3711 as the way to go about it.

[jsumners]

Looks good to me.

[Uzlopak]

Thank you.

[Eomm]

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