My intention was to move to laurent22/joplin-server because I don't want to pay Docker's ransom. But I see there's an option to convert a team account (which is the "joplin" namespace on Docker) to a personal account, so I've contacted them to see if they can do that.
If they do, it's good because we don't need to change anything. Otherwise, I'll move it to the above mentioned name and unfortunately everybody will have to update their server.
So for now, no need to update anything, keep using joplin/server