Dicebear implementation needs update

Allowed URLs need an update: https://git.linux-kernel.at/oliver/ivatar/-/blob/master/config.py#L213

Dicebear API docs: https://dicebear.com/how-to-use/http-api

Maybe keep the 'avatars' subdomain and just add the 'api' subdomain in case it would break some implementation.

added To Do confirmed labels

assigned to @oliver

mentioned in commit 6deea275

mentioned in merge request !222 (merged)

closed with commit 6deea275

changed the incident status to Resolved by closing the incident