Update stale.yml

Author: songyumeng

.github/stale.yml

@@ -8,7 +8,7 @@ exemptLabels:
   - bug
   - enhancement
 # Label to use when marking an issue as stale
-staleLabel: wontfix
+staleLabel: stale
 # Comment to post when marking an issue as stale. Set to `false` to disable
 markComment: >
   This issue has been automatically marked as stale because it has not had