Update stale.yml

Author: dabico

.github/workflows/stale.yml

@@ -16,6 +16,7 @@ jobs:
           repo-token: ${{ secrets.API_TOKEN }}
           stale-issue-label: stale
           exempt-issue-labels: bug
+          exempt-all-assignees: true
           days-before-issue-stale: 30
           days-before-issue-close: 14
           days-before-pr-stale: -1