Update actions/download-artifact action to v5

Author: renovate[bot]

.github/workflows/pages-deploy.yml

@@ -60,7 +60,7 @@ jobs:
     needs: build
     if: success() && github.ref == 'refs/heads/main'
     steps:
-    - uses: actions/download-artifact@v4
+    - uses: actions/download-artifact@v5
       with:
         name: page
         path: "_site"