Is there a good reason why the Cloudron app is missing half a year of updates (of which many security issues)?
The main reason is that their rewrite of the LDAP connector does not work anymore and is pending fixes. I had some attempts to contribute a fix, but I so far lack the in-depth knowledge of the PHP frameworks used. It is still on my list to hopefully be able to contribute a fix. You can track the upstream issue at https://github.com/firefly-iii/firefly-iii/issues/5133