ci: ignore bugs identified in QA process for stalebot

[skip ci]
diff --git a/.github/stale.yml b/.github/stale.yml
index 8b7cb9b..1c2dcf3 100644
--- a/.github/stale.yml
+++ b/.github/stale.yml
@@ -30,6 +30,7 @@
   exemptLabels:
     - valid
     - to-validate
+    - QA
   markComment: >
     This issue has been automatically marked as inactive because it has not had
     recent activity and it wasn't validated by maintainer team. It will be