Only stale unconfirmed issues

.github/stale.yml

@@ -2,11 +2,8 @@
 daysUntilStale: 30
 # 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
-  - fixpending
+onlyLabels:
+  - unconfirmed
 # Label to use when marking an issue as stale
 staleLabel: stale
 # Comment to post when marking an issue as stale. Set to `false` to disable