Update docker.io/library/postgres Docker tag to v15

resources/chaosknoten/lists/docker_compose/compose.yaml.j2

@@ -62,7 +62,7 @@ services:
       - POSTGRES_DB=mailmandb
       - POSTGRES_USER=mailman
       - "POSTGRES_PASSWORD={{ secret__lists__postgres_password }}"
-    image: docker.io/library/postgres:12-alpine
+    image: docker.io/library/postgres:15-alpine
     volumes:
       - /opt/mailman/database:/var/lib/postgresql/data
     networks:

resources/chaosknoten/zammad/docker_compose/compose.yaml

@@ -57,7 +57,7 @@ x-shared:
       LETSENCRYPT_HOST:
       LETSENCRYPT_EMAIL:
 
-    image: ${IMAGE_REPO:-ghcr.io/zammad/zammad}:${VERSION:-6.5.3}
+    image: ${IMAGE_REPO:-ghcr.io/zammad/zammad}:${VERSION:-7.1.2}
     restart: ${RESTART:-always}
     volumes:
       - zammad-storage:/opt/zammad/storage
@@ -76,7 +76,7 @@ services:
     user: 0:0
 
   zammad-elasticsearch:
-    image: elasticsearch:${ELASTICSEARCH_VERSION:-8.19.13}
+    image: elasticsearch:${ELASTICSEARCH_VERSION:-8.19.19}
     restart: ${RESTART:-always}
     volumes:
       - elasticsearch-data:/usr/share/elasticsearch/data