Update action

Author: leandrolerena

.github/workflows/gh-pages.yml

@@ -46,7 +46,7 @@ jobs:
           make doc-build
 
       - name: Upload Artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: site
           path: ./site
@@ -62,7 +62,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Download Artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: site
           path: site