Update stale.yml

Author: ericzbeard

.github/workflows/stale.yml

@@ -25,3 +25,5 @@ jobs:
         stale-pr-message: 'Due to inactivity this PR will be closed in 7 days'
         stale-issue-label: 'no-issue-activity'
         stale-pr-label: 'no-pr-activity'
+        exempt-issue-labels: 'keep'
+        exempt-pr-labels: 'keep'