Please take care of good working DB backups before doing things with Mariadb.
If you OS package does upgrades or you can choose them take a look here for a case where it is better to skip the 10.5 version i think. ( or stay longer with the 10.4 ? )
MariaDB Repo itself have shorter Support time’s then OS package REPOS.
Also better use only OS package REPO"S wen VMIN Webmin.