MariaDB Update

I had the same issue, it seems like MariaDB has updated their site. For now you can just manually upgrade through SSH. Since you're using Debian 12 (which is what I am using as well) this is what I did to update mine:

Bash:
MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysqldump -u admin --verbose --all-databases --routines --triggers > /root/all-databases.sql
service mariadb stop
apt install apt-transport-https curl
curl -o /etc/apt/keyrings/mariadb-keyring.pgp 'https://mariadb.org/mariadb_release_signing_key.pgp'
cp -v -a /var/lib/mysql/ /var/lib/mysql_backup
curl -LsS https://r.mariadb.com/downloads/mariadb_repo_setup | sudo bash -s -- --mariadb-server-version=11.8
apt update
apt install mariadb-server
systemctl start mariadb.service
MYSQL_PWD=`cat /etc/psa/.psa.shadow` mysql_upgrade -uadmin
systemctl restart mariadb
plesk bin service_node --update local
plesk sbin packagemng -sdf

Please note of the following:
After that the database is now on 11.8 (you can change the version number to 11.4 in line 6 where it has the mariadb-server-version set).