Update auto-comment.yml

Author: Andre601

.github/workflows/auto-comment.yml

@@ -17,6 +17,8 @@ jobs:
     steps:
       - name: Checkout Code
         uses: actions/checkout@v2.3.1
+        with:
+          ref: master
       - name: Comment on (un)labeled issue/Pull request
         uses: peaceiris/actions-label-commenter@v1.4.0-0
         with: