My test mastodon instance has been upgraded to v4.5.8, easy peasy.
:batman: Stop Services
:batman: ProxMox Snapshot
:batman: Fetch 4.5.8
:batman: Build
:batman: Start Services
Now that I say it was easy I have cursed myself tho.
Also I hate that I can't use checkbox emojis now because it looks like AI wrote the post. Batman it is.