update CD to use github artifact upload v4

Signed-off-by: Bryan Qiu <bryan.qiu@databricks.com>

Author: bbqiu

.github/workflows/static.yml

@@ -42,7 +42,7 @@ jobs:
           cp ./genai_cookbook/10-min-demo/mosaic-ai-agents-demo-dbx-notebook.html ./genai_cookbook/_build/html/10-min-demo/mosaic-ai-agents-demo-dbx-notebook.html
       # Upload the book's HTML as an artifact
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v2
+        uses: actions/upload-pages-artifact@v4
         with:
           path: "genai_cookbook/_build/html"
       # Deploy the book's HTML to GitHub Pages