prepare kinder workflows for k/k branch rename

[neolit123]

looks like the k/k branch will be renamed from master to main on august 3rd. edit: 9th ?
edit2: all of that was delayed.

https://groups.google.com/a/kubernetes.io/d/msgid/dev/CAOxYG4wipNHR4rAC6SVH8%2BVoQj84Xum%2BTrTRwhsSm3Vjz%3D0KwQ%40mail.gmail.com?utm_medium=email&utm_source=footer

k/k tracking issue:

• Changing default branch name to main kubernetes#105601

we have to update the source code of https://github.com/kubernetes/kubeadm/tree/main/kinder/ci/tools/update-workflows which hardcodes "master". then run kinder/hack/update-workflows.sh and pr k/test-infra and k/kubeadm.

[neolit123]

looks like it was postponed to 1.26 after discussions

[wangyysde]

cc @wangyysde

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[SataQiu]

/remove-lifecycle stale