[ci] Updates upload-artifact action to v4

Author: xyang16

.github/workflows/pr_notebook.yml

@@ -52,7 +52,7 @@ jobs:
           export MAX_EPOCH=2
           bash test_notebook.sh $${{ matrix.group }}
       - name: generated Notebook in html
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: always()
         with:
           name: notebook