⚠️ Align KubeadmConfig to kubeadm v1beta4 types

[fabriziopandini]

What this PR does / why we need it:

Which issue(s) this PR fixes:
Fixes #10708

Area example:
/area provider/bootstrap-kubeadm

[k8s-ci-robot]

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[fabriziopandini]

/test

[k8s-ci-robot]

@fabriziopandini: The /test command needs one or more targets.
The following commands are available to trigger required jobs:

/test pull-cluster-api-build-main

/test pull-cluster-api-e2e-blocking-main

/test pull-cluster-api-e2e-conformance-ci-latest-main

/test pull-cluster-api-e2e-conformance-main

/test pull-cluster-api-e2e-latestk8s-main

/test pull-cluster-api-e2e-main

/test pull-cluster-api-e2e-mink8s-main

/test pull-cluster-api-e2e-upgrade-1-33-1-34-main

/test pull-cluster-api-test-main

/test pull-cluster-api-test-mink8s-main

/test pull-cluster-api-verify-main

The following commands are available to trigger optional jobs:

/test pull-cluster-api-apidiff-main

Use /test all to run the following jobs that were automatically triggered:

pull-cluster-api-apidiff-main

pull-cluster-api-build-main

pull-cluster-api-e2e-blocking-main

pull-cluster-api-test-main

pull-cluster-api-verify-main

In response to this:

/test

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[fabriziopandini]

/test pull-cluster-api-e2e-conformance-ci-latest-main
/test pull-cluster-api-e2e-conformance-main
/test pull-cluster-api-e2e-latestk8s-main
/test pull-cluster-api-e2e-main
/test pull-cluster-api-e2e-mink8s-main
/test pull-cluster-api-e2e-upgrade-1-33-1-34-main

[k8s-ci-robot]

@fabriziopandini: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-cluster-api-e2e-upgrade-1-33-1-34-main	ad132fa	link	true	/test pull-cluster-api-e2e-upgrade-1-33-1-34-main
pull-cluster-api-e2e-mink8s-main	ad132fa	link	true	/test pull-cluster-api-e2e-mink8s-main
pull-cluster-api-e2e-main	ad132fa	link	true	/test pull-cluster-api-e2e-main
pull-cluster-api-e2e-latestk8s-main	ad132fa	link	true	/test pull-cluster-api-e2e-latestk8s-main

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.