Fix version in stale workflow

Author: jborean93

.github/workflows/stale.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/stale@4.0.0
+    - uses: actions/stale@v4.0.0
       id: stale
       with:
         days-before-stale: 28