According to the following:
docs.cpanel.net
it says that cPanel supports MariaDB version 10.2, however during the UPCP process the repository can not be found (returns a 404 error).
Browsing through other threads, we saw issues with version 10.3 and above that were temporary and were eventually solved.
Is the 10.2 issues is some temporary glitch which is expected to be solved or must I upgrade MariaDB?
MySQL/MariaDB Upgrade | cPanel & WHM Documentation
This interface allows you to manage MySQL® or MariaDB® version upgrades (for example, when you upgrade from MySQL 5.6 to 5.7).

Browsing through other threads, we saw issues with version 10.3 and above that were temporary and were eventually solved.
Is the 10.2 issues is some temporary glitch which is expected to be solved or must I upgrade MariaDB?