Fetch compose file from the git tag and use compose v2

- goauthentik.io/version/<x>/docker-compose.yml only exists for old releases; download lifecycle/container/compose.yml of the version tag instead and always store it as docker-compose.yml
- restart handler used the removed docker_compose (v1) module; switch to community.docker.docker_compose_v2

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

handlers/main.yml

@@ -1,7 +1,8 @@
 ---
+# docker_compose (compose v1) is gone; v2 uses the docker compose CLI plugin
 - name: restart authentik
-  docker_compose:
+  community.docker.docker_compose_v2:
     project_src: "{{ authentik_inst }}"
     state: present
-    restarted: yes
+    pull: missing
     remove_orphans: yes