remove bouncycastle dependency for EC key support

[coopstah13]

Is your task related to a problem? Please describe

Newer version of BouncyCastle doesn't work with BCFIPS provider

Describe the solution you'd like

Remove dependency on BouncyCastle and rely on JDK only. The dependency is only used for EC keys, but they are supported since at least JDK8.

Describe alternatives you've considered

I have pinned the transitive bouncycastle dependency to an older version (1.68) in our repository as it seems to be the last one that doesn't have the problem.

Additional context

No response

[shawkins]

@coopstah13 do you have suggested changes for this? The test case that was added for bcfips does not work with just the jdk - it fails with "java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException : version mismatch: (supported: 00, parsed: 01 ..."

[manusa]

We probable need to add a specific case for
CertUtils#handleECKey so that we don't require the usage of BouncyCastle libraries for Elastic keys.

The idea would be to add some sort of fallback mechanism in

kubernetes-client/kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/internal/CertUtils.java

Line 198 in 2f11261

Object pemObject = new PEMParser(new InputStreamReader(keyInputStream)).readObject();

so that we attempt to use the JDK-provided classes and then use BouncyCastle if the JVM doesn't provide them.