Older upgrade package repositories have been deprecated. New packages are available at pkgs.k8s.io
https://kubernetes.io/blog/2023/08/15/pkgs-k8s-io-introduction/
Separate package repository for each minor version.
kubeadm needs to be upgraded first, so it can upgrade the cluster to the version it was upgraded to.
kubeadm does not upgrade the kubelet
Run kubeadm upgrade apply <version> to upgrade the cluster (aside from the kubelet) to version