Update kubernetes-client-api to 5.4.1

[Vlatombe]

Downstream of https://github.com/jenkinsci/kubernetes-client-api-plugin/releases/tag/kubernetes-client-api-5.4.1

This plugin is not broken by kubernetes-api 5.x api changes. This is a nice to have.

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[maxlaverse]

Thanks @Vlatombe