It was 6.9.3 once I booted after the move. I assume it had been updated but waiting for a reboot to use the new kernel. Until I rebooted, it was probably still running on the 6.0.9 image.
If uptime and having the latest kernel ever becomes something I care about for this server, I might switch to Ubuntu Pro. It is free for personal use and it includes kernel livepatching. I can’t imagine why I would need it for this use case though.