Update ghcr.io/goauthentik/server Docker tag to v2025.8.4

ansible/assets/docker-ext/compose.yml.j2

@@ -180,7 +180,7 @@ services:
       timeout: 3s
   authentik-server:
     container_name: authentik-server
-    image: ghcr.io/goauthentik/server:2025.6.2
+    image: ghcr.io/goauthentik/server:2025.8.4
     restart: unless-stopped
     command: server
     environment:
@@ -214,7 +214,7 @@ services:
       - "traefik.http.routers.authentik.middlewares=crowdsec@docker"
   authentik-worker:
     container_name: authentik-worker
-    image: ghcr.io/goauthentik/server:2025.6.2
+    image: ghcr.io/goauthentik/server:2025.8.4
     restart: unless-stopped
     command: worker
     environment: