chore(workflows/dependencies): update juliangruber/approve-pull-request-action action to v2.0.4

Author: renovate[bot]

.github/workflows/update-artifacthub-images.yaml

@@ -65,7 +65,7 @@ jobs:
           PR_NUMBER: ${{ steps.create-pr.outputs.pull-request-number }}
           merge-method: squash
       - if: ${{ steps.create-pr.outputs.pull-request-number }}
-        uses: juliangruber/[email protected].0
+        uses: juliangruber/[email protected].4
         with:
           github-token: ${{ secrets.ACTIONS_BOT_TOKEN }}
           number: ${{ steps.create-pr.outputs.pull-request-number }}