fix v4 oversight

.gitea/workflows/site.yml

@@ -26,7 +26,7 @@ jobs:
       
       - name: Upload
         if: github.ref == 'refs/heads/main' && github.event_name == 'push'
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: site
           path: _site/