Proxmox VE upgrades

Planning Proxmox VE major upgrades, now that Proxmox VE 8 on Debian 12 has reached end of life.

Proxmox VE 8 to 9 upgrade

Upgrading clusters from end-of-life Proxmox VE 8 to 9: reaching 8.4 and Ceph Squid first, running pve8to9, in-place versus fresh install, old containers broken by the cgroup v1 removal, and interface renaming risks.

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