chore: add whitelist to autoclose workflow in dart

Author: ChiragAgg5k

templates/dart/.github/workflows/autoclose.yml

@@ -6,6 +6,7 @@ on:
 
 jobs:
   auto_close:
+    if: github.head_ref != 'dev'
     uses: appwrite/.github/.github/workflows/autoclose.yml@main
     secrets:
       GH_AUTO_CLOSE_PR_TOKEN: ${{ secrets.GH_AUTO_CLOSE_PR_TOKEN }}