Update stale.yml (espressif#5299)

Stale bot labels fix.

Author: VojtechBartoska

.github/stale.yml

@@ -26,7 +26,7 @@ exemptMilestones: false
 exemptAssignees: false
 
 # Label to use when marking as stale
-staleLabel: Status: Stale
+staleLabel: "Status: Stale"
 
 # Comment to post when marking as stale. Set to `false` to disable
 markComment: >