update kubernetes to 1.30.0

[Schnitzel]

Changes

Update Kubernetes Plugin to 1.30.0. The sub-plugin kubernetes-client-api has released it's major version 5.4.1 which is not compatible with kubernetes:1.29.6, but unfortunately the startup script of the jenkins will install kubernetes-client-api:5.4.1 which ends up in all kind of strange issues. Like for us it started to endlessly create pods because of this error:
java.lang.NoSuchMethodError: io.fabric8.kubernetes.client.dsl.PodResource.watch

I tested this with adding

  basePlugins:
    - name: kubernetes
      version: 1.30.0
    - name: workflow-job
      version: '2.41'
    - name: workflow-aggregator
      version: '2.6'
    - name: git
      version: 4.7.2
    - name: job-dsl
      version: '1.77'
    - name: configuration-as-code
      version: '1.51'
    - name: kubernetes-credentials-provider
      version: 0.18-1

to the helmfiles and after that it all works again.

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