Reverted back to version 8 of stale workflow due to a bug in their caching implementation (see actions/stale#1133).

Author: dbuechel

.github/workflows/issues.yml

@@ -11,7 +11,7 @@ jobs:
       issues: write
       pull-requests: write
     steps:
-      - uses: actions/stale@v9
+      - uses: actions/stale@v8
         with:
           # https://github.com/marketplace/actions/close-stale-issues
           days-before-issue-stale: 28