override wontifx default and remove label check (#11744)

.github/stale.yml

@@ -4,14 +4,12 @@ only: pulls
 # Number of days of inactivity before an issue becomes stale
 daysUntilStale: 60
 
+# Override the default Label of "wontfix"
+staleLabel: ""
+
 # Number of days of inactivity before a stale issue is closed
 daysUntilClose: 7
 
-# Issues with these labels will never be considered stale
-exemptLabels:
-  - pinned
-  - security
-
 # Comment to post when marking an issue as stale. Set to `false` to disable
 markComment: >
    This issue was automatically marked as stale due to a lack of recent activity.