Bump upload-artifact version to v3 in order to fix deprecated error o…

…n build-docs.

`This request has been automatically failed because it uses a deprecated version of `actions/upload-artifact: v2`. Learn more: https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/`

.github/workflows/publish-docs.yml

@@ -29,7 +29,7 @@ jobs:
 
     - name: Build jupyter book
       run: jb build docs --warningiserror --keep-going # set doc to fail on any sphinx warning
-    - uses: actions/upload-artifact@v2
+    - uses: actions/upload-artifact@v3
       if: always()
       with:
         name: docs-build