Remove 'v1beta1' from admissionReviewVersions

[guettli]

What would you like to be added (User Story)?

I am looking at this line:

// +kubebuilder:webhook:verbs=create;update,path=/validate-bootstrap-cluster-x-k8s-io-v1beta2-kubeadmconfig,mutating=false,failurePolicy=fail,matchPolicy=Equivalent,groups=bootstrap.cluster.x-k8s.io,resources=kubeadmconfigs,versions=v1beta2,name=validation.kubeadmconfig.bootstrap.cluster.x-k8s.io,sideEffects=None,admissionReviewVersions=v1;v1beta1

I think in admissionReviewVersions v1beta1 can be removed, because v1 is stable.

Afaik capi does not support mgt-clusters with old Kube versions which still use v1beta1.

If you agree, I could create a PR which removes that version from admissionReviewVersions.

Label(s) to be applied

/kind feature
One or more /area label. See https://github.com/kubernetes-sigs/cluster-api/labels?q=area for the list of labels.

[chrischdi]

/triage accepted

/help

[k8s-ci-robot]

@chrischdi:
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In response to this:

/triage accepted

/help

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[chrischdi]

We have to consider if there are supported management cluster versions which do use v1beta1 here, but I guess no.