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## Description
When an EC2 instance boots up with a flatcar image (even the latest) the kubelet fails.
The userdata defines (and should do so) that the `/etc/eks/bootstrap.sh` should run, which it does.
This seems to add a ExecStartPre to the kubelet.service:
`ExecStartPre=/usr/share/oem/eks/download-kubelet.sh`
Both the `bootstrap.sh` and the `download-kubelet.sh` are consistent with:
https://github.com/flatcar-linux/coreos-overlay/blob/main/coreos-base/flatcar-eks/files/bootstrap.sh
https://github.com/flatcar-linux/coreos-overlay/blob/main/coreos-base/flatcar-eks/files/download-kubelet.sh
The `download-kubelet.sh` fails with `Unsupported Kubernetes version` because in the case statement on line 24->50 (https://github.com/flatcar-linux/coreos-overlay/blob/main/coreos-base/flatcar-eks/files/download-kubelet.sh#L25) only has values for kubernetes version 1.15 -> 1.21
If I manually alter the file and add 1.22 (when I test this on 1.22.9 kubernetes version deployment) and re-run the `bootsrap.sh` it works fine as far as I can see, the node than joins the cluster and shows up as `Ready` and pods starting running on the node.
The last PR I can see on this particular thing was done about a year ago f0da7f8c9e
## Impact
No EKS support for kubernetes versions higher than 1.21
## Environment and steps to reproduce
1. **Set-up**: Create an EKS cluster with the latest flatcar AMI in the worker nodes
2. **Task**: SSH into the node (probably through a Bastion)
3. **Action(s)**: No actions needed
4. **Error**: kubelet.service fails because the download-kubelet.sh doesn't have download locations for kubernetes version above 1.21
## Expected behavior
Download locations for kubernetes versions 1.22 and 1.23 (EKS doesn't have support for 1.24 yet it seems) should be located inside the download-kubelet.sh
## Additional information
By running `aws s3 ls s3://amazon-eks/` you can list the available locations of the other versions, so for it should result in this:
``` sh
case $CLUSTER_VERSION in
1.23)
S3_PATH="1.23.9/2022-07-27/"
;;
1.22)
S3_PATH="1.22.12/2022-07-27/"
;;
1.21)
S3_PATH="1.21.2/2021-07-05"
;;
1.20)
S3_PATH="1.20.4/2021-04-12"
;;
1.19)
S3_PATH="1.19.6/2021-01-05"
;;
1.18)
S3_PATH="1.18.9/2020-11-02"
;;
1.17)
S3_PATH="1.17.12/2020-11-02"
;;
1.16)
S3_PATH="1.16.15/2020-11-02"
;;
1.15)
S3_PATH="1.15.12/2020-11-02"
;;
*)
echo "Unsupported Kubernetes version"
exit 1
;;
esac
```