fix: remove deprecated compose version tag

examples/traefik/docker-compose.yml

@@ -1,19 +1,22 @@
-version: '3'
 services:
+
   traefik:
+    image: traefik:v3.1    
     container_name: traefik
-    image: traefik:v3.1
+    restart: always    
     ports:
-      - 80:80/tcp # HTTP
-      - 443:443/tcp # HTTPS
-      - 443:443/udp # HTTPS via HTTP/3 QUIC UDP
-      - 127.0.0.1:8080:8080 # MGMT WEB UI
+      - 80:80/tcp # http
+      - 443:443/tcp # https
+      - 443:443/udp # https http3 quic
+      - 127.0.0.1:8080:8080 # http api dashboard
+    expose:
+      - 80 # http
+      - 443 # https
+      - 8080 # http api dashboard
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock:ro # ro = read-only access to the docker.sock
       - ${DOCKER_VOLUME_STORAGE:-/mnt/docker-volumes}/traefik:/etc/traefik/ # put the provided traefik.yml and fileConfig.yml files at this location
       - ${DOCKER_VOLUME_STORAGE:-/mnt/docker-volumes}/traefik/logs:/logs
-    networks:
-      - proxy
     environment:
       - TZ=Europe/Berlin
       - CF_DNS_API_TOKEN=MyCloudflareApiToken # change this if you use Cloudflare
@@ -23,10 +26,11 @@ services:
       - traefik.http.routers.api.service=api@internal # Enable Traefik API.
       - traefik.http.routers.api.middlewares=local-ipwhitelist@file,basic-auth@file # protect dashboard with basic auth and restrict access to private class subnets only
       #- traefik.http.middlewares.basic-auth-global.basicauth.users=admin:$$apr1$$epoKf5li$$QfTMJZOCS/halv3CiIUEu0 # protect the traefik dashboard by basic auth (pw=password)
-    restart: always
     extra_hosts:
       - host.docker.internal:172.17.0.1
+    networks:
+      - proxy    
 
 networks:
   proxy:
-    external: true
+    external: true