chore(deps): update mariadb docker tag to v12 (#28)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

compose.yml

@@ -70,7 +70,7 @@ services:
   # Database
   # ---------------------------------------------------------------------
   db:
-    image: mariadb:11
+    image: mariadb:12
     restart: unless-stopped
     mem_limit: 2g
     cpus: 2.0