Update TLS cipher suites for API server

[lennardk]

These are the recommended values from CIS 0.12 guidelines

Pull Request

What?

Update the tls cipher suites for the API server to the cis 0.12 guidelines

Why?

To follow latest security guidelines and to allow users to remain compliant with cis benchmarks. Due to the additive nature of tls-cipher-suites processing, users cannot otherwise remove ciphers marked as insecure in the benchmark (TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256).

Acceptance

Please use the following checklist:

• you linked an issue (if applicable)
• you included tests (if applicable)
• you ran conformance (make conformance)
• you formatted your code (make fmt)
• you linted your code (make lint)
• you generated documentation (make docs)
• you ran unit-tests (make unit-tests)

See make help for a description of the available targets.