upgraded download artifact to v4

Author: brunoNetId

.github/workflows/docs.yml

@@ -31,7 +31,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v2
       - name: Download generated site
-        uses: actions/download-artifact@v1
+        uses: actions/download-artifact@v4
         with:
           name: site
           path: "${{ github.workspace }}/${{ env.SITE_DIR }}"