ci(mariadb): Thin out mariadb matrix

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

.github/workflows/phpunit-mariadb.yml

@@ -60,13 +60,13 @@ jobs:
       fail-fast: false
       matrix:
         php-versions: ['8.2']
-        mariadb-versions: ['10.6', '10.11', '11.4', '11.8']
+        mariadb-versions: ['10.6']
         include:
           - php-versions: '8.3'
             mariadb-versions: '10.11'
             coverage: ${{ github.event_name != 'pull_request' }}
           - php-versions: '8.4'
-            mariadb-versions: '11.8'
+            mariadb-versions: '11.4'
           - php-versions: '8.5'
             mariadb-versions: '11.8'