Update prune branches action

.github/workflows/prune.yml

@@ -6,18 +6,17 @@ on:
   schedule:
     - cron: '0 15 * * 3'
 
-permissions:
-  issues: write
-  contents: write
-
 jobs:
   tag:
     name: Prune Branches
     runs-on: ubuntu-latest
     timeout-minutes: 30
+    permissions:
+      pull-requests: read
+      contents: write
     steps:
       - name: Prune stale branches
-        uses: crs-k/stale-branches@v5.0.0
+        uses: balvajs/delete-stale-branches@v2
         with:
-          days-before-stale: 7
-          days-before-delete: 14
+          dry-run: false
+          days-to-delete: 7