Refer to action.yml not Dockerfile

Author: shmokmt

.github/workflows/depup.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: reviewdog/action-depup@v1
         id: depup
         with:
-          file: Dockerfile
+          file: action.yml
           version_name: REVIEWDOG_VERSION
           repo: reviewdog/reviewdog