Steps to reproduce:

• Install unsupported database version. Alternatively a fake maximum supported version may be set in code to reproduce it https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/include/zbx_dbversion_constants.h
• Open Dashboards -> System information dashboard

Result:
See screenshot

Current MariaDB version is "12.02.02" with leading zeroes.

Expected:
Current MariaDB version is "12.2.2" with no leading zeroes.

This should work for all databases this way.