Fix - Missing actions permission in triage bot (#21454)

# Summary

This PR adds the missing actions write permission to the triage bot.

# Details

The actions write permission is required to access the actions cache
that is needed for operations-per-run continuity. This one was simply
missing.

.github/workflows/stale.yml

@@ -7,6 +7,7 @@ on:
   workflow_dispatch: # Allow manual trigger
 
 permissions:
+  actions: write
   issues: write
   pull-requests: write