ci: pin to v1.6.0

Author: peaceiris

.github/workflows/label-commenter.yml

@@ -23,7 +23,7 @@ jobs:
           ref: master
 
       - name: Label Commenter
-        uses: peaceiris/actions-label-commenter@v1.5.1-1
+        uses: peaceiris/actions-label-commenter@v1.6.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           # config_file: .github/label-commenter-config.yml