Update docker.io/library/postgres Docker tag to v18

docker-compose.yml

@@ -2,7 +2,7 @@ name: authentik
 
 services:
   server:
-    image: ghcr.io/goauthentik/server:2026.2.1
+    image: ghcr.io/goauthentik/server:2025.12.4
     container_name: authentik_server
     depends_on:
       - db_pg17
@@ -30,7 +30,7 @@ services:
       - secret
 
   worker:
-    image: ghcr.io/goauthentik/server:2026.2.1
+    image: ghcr.io/goauthentik/server:2025.12.4
     container_name: authentik_worker
     depends_on:
       - db_pg17
@@ -75,7 +75,7 @@ services:
       - mail_server
 
   ldap:
-    image: ghcr.io/goauthentik/ldap:2026.2.1
+    image: ghcr.io/goauthentik/ldap:2025.12.4
     container_name: authentik_ldap
     depends_on:
       - server
@@ -95,7 +95,7 @@ services:
       - ldap_api_key
 
   db_pg17:
-    image: docker.io/library/postgres:17.9
+    image: docker.io/library/postgres:18.2
     container_name: authentik_db_pg17
     restart: unless-stopped
     healthcheck: