kubeadm: started using k8s.io/system-validators v1.12.1 in kubeadm 1.35. During `kubeadm init`, `kubeadm join` and `kubeadm upgrade`, the SystemVerification preflight check will throw an error if cgroups v1 is detected and if the detected kubelet version is 1.35 or newer. For older versions of kubelet, there will be just a preflight warning.