fix: bump kubeadm

[iamfletch]

Change description

beta3 was deprecated a while ago, beta4 should have been available since 1.31. Bumping now because its been fully removed from 1.37.

more info at kubeadm https://kubernetes.io/docs/reference/config-api/kubeadm-config.v1beta4/

Fixes

Fixes #2151
Fixes #2153

Additional context

• builds failed during image cache pull, kubeadm refused to run
• build worked after switching to beta4

[kubernetes-prow]

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[linux-foundation-easycla]

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• ✅ login: iamfletch / name: Simon Fletcher (db2e0f4)

[kubernetes-prow]

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[kubernetes-prow]

Hi @iamfletch. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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[drew-viles]

/ok-to-test

[drew-viles]

/lgtm

[drew-viles]

/assign @mboersma