Fail forward to download v4 in case it fixes break caused by upload v4

Author: holly-cummins

.github/workflows/build_and_publish.yml

@@ -121,7 +121,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4 # not needed for the code, but needed for the git config
       - name: Download Built site
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: site
           path: site