By default, yes. As that is the Ceph version one can update from the older Proxmox VE 5.4, and we need to stay compatible with that.Could it be, that apt-get update/apt-get dist-upgrade doesn't update the base ceph packages beyond 12.2.11?
If you use Ceph on a Proxmox VE setup only as client I'd still recommend setting up the Ceph repository from us (but no need for full ceph server installation) see https://pve.proxmox.com/pve-docs/chapter-sysadmin.html#sysadmin_package_repositories_ceph and run a standard system upgrade (
apt update && apt full-upgradeor do so from the web-interface) to pull in newer client and librbd versions.
A migration afterwards is then still required to load the new librbd for the VMs.