fix: remove deprecated compose version tag

examples/firefly/docker-compose.yml

@@ -1,6 +1,5 @@
-version: '3.3'
-
 services:
+
   app:
     image: fireflyiii/core:latest
     container_name: firefly
@@ -10,11 +9,13 @@ services:
     env_file: .env
     ports:
       - 80:8080
+    expose:
+      - 8080
     depends_on:
       - db
   
   db:
-    image: mariadb    
+    image: mariadb:11.5
     container_name: firefly-db
     restart: unless-stopped
     environment:
@@ -23,4 +24,4 @@ services:
       - MYSQL_PASSWORD=MySecretDatabasePassword # if changed --> also update in .env file
       - MYSQL_DATABASE=firefly
     volumes:
-      - ${DOCKER_VOLUME_STORAGE:-/mnt/docker-volumes}/firefly/mysql:/var/lib/mysql
+      - ${DOCKER_VOLUME_STORAGE:-/mnt/docker-volumes}/firefly/mysql:/var/lib/mysql