Fixed deprecated

Author: MirkoZETA

.github/workflows/fns-api-workflow.yml

@@ -73,7 +73,7 @@ jobs:
         uses: actions/configure-pages@v3
 
       - name: Download artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: github-pages