wip: ci: factor out deployment into separate steps for better org.

.forgejo/workflows/deploy.yaml

@@ -80,7 +80,7 @@ jobs:
           rsync -v -r --delete -e "ssh -i deploykey.priv -o 'UserKnownHostsFile ./known_hosts'" public/ ccchh-website-deploy@public-web-static-intern.hamburg.ccc.de:/var/www/hamburg.ccc.de/
 
       - name: Upload the website build as an artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: website-build
           path: public/
@@ -91,7 +91,7 @@ jobs:
       image: code.forgejo.org/oci/node:22-bookworm
     steps:
       - name: Download the website build artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: website-build
 
@@ -114,7 +114,7 @@ jobs:
       image: code.forgejo.org/oci/node:22-bookworm
     steps:
       - name: Download the website build artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: website-build