Error delete _state: [403] Resource not accessible by integration - https://docs.github.com/rest/actions/cache#delete-github-actions-caches-for-a-repository-using-a-cache-key

If you think that not enough issues were processed you could try to increase the quantity related to the operations-per-run (​https://github.com/actions/stale#operations-per-run​) option which is currently set to 500