chore(ci): restore bump schedule to 05:17 UTC

Revert the temporary 17:39 test time now that the manual run has been
kicked off; keep the daily cadence.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/bump.yml

@@ -28,7 +28,7 @@ name: Lock bump
 
 on:
   schedule:
-    - cron: '39 17 * * *'   # daily 17:39 UTC
+    - cron: '17 5 * * *'   # daily 05:17 UTC
   workflow_dispatch:
 
 jobs: