chore(github/stalebot): update stalebot config

.github/stale.yml

@@ -12,10 +12,10 @@ issues:
   # Issues with these labels will never be considered stale
   exemptLabels:
     - kind/enhancement
-    - kind/feature
     - kind/question
     - kind/style
     - kind/workaround
+    - kind/bug
     - bug/need-confirmation
     - bug/confirmed
     - status/discuss
@@ -52,4 +52,3 @@ issues:
 
     Note - If it is an old bug report, make sure that it is reproduceable in the
     latest version of Portainer as it may have already been fixed.
-