chore: update deploy log for 21:30 UTC cron [skip ci]

Author: actions-user

data/deploy_log.jsonl

@@ -366,3 +366,4 @@
 {"date": "2026-07-17", "status": "success"}
 {"date": "2026-07-18", "status": "success"}
 {"date": "2026-07-19", "status": "success"}
+{"date": "2026-07-20", "status": "success"}