Failed to save: Failed to CreateCacheEntry: Received non-retryable error: Failed request: (409) Conflict: cache entry with the same key, version, and scope already exists

Error delete _state: [403] Resource not accessible by integration

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 300