Fix stale workflow

Author: zimmerle

Diff for: .github/workflows/stale.yml

@@ -7,13 +7,13 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/stale@v1
+    - uses: actions/stale@v3
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days'
         stale-pr-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days'
-        stale-issue-label: 'stale'
-        stale-pr-label: 'stale'
-        exempt-issue-label: 'nostale'
+        stale-issue-label: 'no-issue-activity'
+        stale-pr-label: 'no-pr-activity'
+        exempt-issue-label: 'nostale,work-in-progress'
         days-before-stale: 30
         days-before-close: 5