Upgrade hetzner host

[b-n]

Hetzner changed their pricing plans. CX22 is the same as CX23, however it's ever so slightly cheaper now, which is kinda nice of them.

Upgrade process:

1. Kill k3s: sudo systemctl stop k3s.service
2. Kill the running workloads: /usr/local/bin/k3s-killall.sh
3. Shutdown the machine: sudo shutdown now
4. Wait for the machine to be offline via the console
5. On the console -> Rescale -> Select the upgrade -> Go
6. Wait for the machine to come back online
7. Double check via k9s that all the things are running, double check the sites, upgrade is done
8. Change infra/tf/k3s.tf to match the machine type (this PR)
9. Decrypt state, plan (had 0 diffs), apply for the sake of it, re-encrypt state, add to git
10. Make the PR, done.

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