docker-compose(deps): Bump library/mariadb in /docker/compose

Bumps library/mariadb from 11 to 12.

---
updated-dependencies:
- dependency-name: library/mariadb
  dependency-version: '12'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

docker/compose/docker-compose.mariadb-tika.yml

@@ -35,7 +35,7 @@ services:
     volumes:
       - redisdata:/data
   db:
-    image: docker.io/library/mariadb:11
+    image: docker.io/library/mariadb:12
     restart: unless-stopped
     volumes:
       - dbdata:/var/lib/mysql

docker/compose/docker-compose.mariadb.yml

@@ -31,7 +31,7 @@ services:
     volumes:
       - redisdata:/data
   db:
-    image: docker.io/library/mariadb:11
+    image: docker.io/library/mariadb:12
     restart: unless-stopped
     volumes:
       - dbdata:/var/lib/mysql