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

inventories/chaosknoten/host_vars/pad.yaml

@@ -11,6 +11,3 @@ nginx__version_spec: ""
 nginx__configurations:
   - name: pad.hamburg.ccc.de
     content: "{{ lookup('ansible.builtin.file', 'resources/chaosknoten/pad/nginx/pad.hamburg.ccc.de.conf') }}"
-
-# renovate: datasource=docker depName=quay.io/hedgedoc/hedgedoc
-host_pad__docker_compose__hedgedoc_version: 1.11.1

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

@@ -13,7 +13,7 @@ services:
     restart: unless-stopped
 
   app:
-    image: quay.io/hedgedoc/hedgedoc:{{ host_pad__docker_compose__hedgedoc_version }}
+    image: quay.io/hedgedoc/hedgedoc:1.11.0
     environment:
       - "CMD_DB_URL=postgres://hedgedoc:{{ secret__hedgedoc_db_password }}@database:5432/hedgedoc"
       - "CMD_DOMAIN=pad.hamburg.ccc.de"