Revert to v4 due to issue 795

actions/stale#795
stale bot sees bot comment as activity, resetting the stale clock incorrectly

Author: ghogen

.github/workflows/stale.yml

@@ -13,7 +13,7 @@ jobs:
       pull-requests: write
 
     steps:
-    - uses: actions/stale@v5.1.1
+    - uses: actions/stale@v4.0.0
       with:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         days-before-pr-stale: 14