chore(deps): update mariadb docker tag to v11.6

Author: renovate[bot]

.github/workflows/analysis-coverage.yml

@@ -48,7 +48,7 @@ jobs:
 
     services:
       mariadb:
-        image: mariadb:11.5
+        image: mariadb:11.6
         env:
           MARIADB_ROOT_PASSWORD: rootpassword
           MYSQL_DATABASE: nextcloud
@@ -444,7 +444,7 @@ jobs:
 
     services:
       mariadb:
-        image: mariadb:11.5
+        image: mariadb:11.6
         env:
           MARIADB_ROOT_PASSWORD: rootpassword
           MYSQL_DATABASE: nextcloud