Missed one more set-output

.github/workflows/pull_request.yml

@@ -119,7 +119,7 @@ jobs:
         run: |
           branch_name='preview-${{ github.event.pull_request.number }}'
           git diff origin/main -- '*.html' >/dev/null && changes=true || changes=false
-          echo ::set-output name=changes::$changes
+          echo "changes=$changes" >> $GITHUB_OUTPUT
           git add . --force
           git commit -m 'Render preview' || echo "No changes to commit"
           git pull --set-upstream origin $branch_name --allow-unrelated-histories --strategy-option=ours