ci: fix stale workflow [skip ci]

.github/workflows/stale.yml

@@ -1,4 +1,5 @@
 name: Stale Issues
+
 on:
   schedule:
     - cron: '0 1 * * *'
@@ -10,7 +11,7 @@ jobs:
   stale:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/stale
+      - uses: actions/stale@v6
         with:
           days-before-stale: 180
           days-before-close: 30