Fix typo

Author: tarleb

.github/workflows/website.yml

@@ -32,7 +32,7 @@ jobs:
             PANDOC="docker run --rm --volume $(pwd):/data \
               --user $(id -u):$(id -g) pandoc/core:latest"
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@v3
         with:
           path: '_site'
       - name: Deploy to GitHub Pages