fix ansible lint issues

roles/docker_s3_backup/tasks/main.yml

@@ -71,7 +71,7 @@
 
 # TODO: do this in a more native way rather than a python script reading env vars.
 - name: Determine which backups should be deleted.
-  script: scripts/determine-s3-keys-to-delete.py
+  ansible.builtin.script: scripts/determine-s3-keys-to-delete.py
   environment:
     S3_RESULTS: "{{ s3_list_outputs.results }}"
     NUM_BACKUPS_TO_KEEP: "{{ docker_backup_retain_count }}"