[ci] Updates upload-artifact action to v4 (#210)

Author: xyang16

.github/workflows/pr_notebook.yml

@@ -52,8 +52,8 @@ 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
+          name: notebook-${{ matrix.group }}
           path: test_output/