Add MariaDB 12.3 LTS container to testing matrix #3593581

Andrey Postnikovrequested to merge
issue/drupal-3593581:3593581-add-mariadb-12.3 into main

Add mariadb-12.3 to the 'MariaDB (via PDO)' MR matrix so core runs its test suite against the new MariaDB 12.3 LTS DrupalCI container.

Closes #3593581

related to #3593556

Edited by Andrey Postnikov

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