MaxMindDB needs update. That might not be the right link, but search. You need to get an API key from maxmind.
I don’t see a proper howto on this subject. @jomaxro, you might want to check that there is one.
Yeah. Not easy to find Upgrade / Rebuilds Fail due to MaxMind DB EOL - #23 by sam.
But I think I remember that the admin page links to the docs?