Pin MariaDB to version 8.0 and remove :latest tags

Use specific MariaDB 8.0 version instead of latest to avoid compatibility issues. Remove :latest tag from WordPress for cleaner syntax.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   wordpress:
-    image: wordpress:latest
+    image: wordpress
     restart: always
     expose:
       - 80
@@ -22,7 +22,7 @@ services:
       - walter-coiffure-net
       - traefik-net
   db:
-    image: mariadb:latest
+    image: mariadb:8.0
     restart: always
     environment:
       - MYSQL_ROOT_PASSWORD=${MYSQL_ROOT_PASSWORD}