Fixing expired kubeadm certs

I had my kubernetes certificate expire as I was publishing the last blog post, and was able to resolve it by following these steps on Fedora with kubeadm:

Confirm they are expired by running
```
; kubeadm certs check-expiration
```
Update the certificates manually by shelling into a control plane node and running:
```
; kubeadm certs renew all
```

Now, upgrade to the next version of kubeadm you can update to. Find your version with:

; kubeadm version
kubeadm version: &version.Info{Major:"1", Minor:"26", GitVersion:"v1.26.9", GitCommit:"d1483fdf7a0578c83523bc1e2212a606a44fd71d", GitTreeState:"clean", BuildDate:"2023-09-13T11:31:28Z", GoVersion:"go1.20.8", Compiler:"gc", Platform:"linux/amd64"}

Then find the last patch version of the next major release:

; yum list --disablerepo='*' --enablerepo=kubernetes --showduplicates --disableexcludes=kubernetes

Install that version:

; sudo yum install -y kubeadm-'1.28.2-*' --disableexcludes=kubernetes

Plan an upgrade:
```
; sudo kubeadm upgrade plan
```
Apply the version you installed earlier, even if plan tells you about a later version:
```
; sudo kubeadm upgrade apply v1.26.9
```

Upgrade kubelet:

; sudo yum install -y kubelet-'1.26.9-*' kubectl-'1.26.9-*' --disableexcludes=kubernetes

On each worker node, install the same version of kubeadm:

; sudo yum install -y kubeadm-'1.26.8-*' --disableexcludes=kubernetes

Upgrade the node:
```
; sudo kubeadm upgrade node
```

Upgrade kubelet:

; sudo yum install -y kubelet-'1.26.9-*' kubectl-'1.26.9-*' --disableexcludes=kubernetes

On a control plane node, copy the admin.conf to your user's config:
```
; sudo cp /etc/kubernetes/admin.conf ~/.kube/config
```

Copy the new kube config to your machine for access:

; cd ~/.kube
; mv config config.bak
; rsync k1.home.arpa:~/.kube/config config

I also had to run

; sudo dnf remove zram-generator-defaults
; sudo swapoff -a

to permanently disable swap, which was causing kubelet to fail.