Bump actions/upload-artifact from 3 to 4 (#23)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build-website.yaml

@@ -45,7 +45,7 @@ jobs:
         run: python website_builder/builder.py -c -f results
 
       - name: Upload the generated HTML
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: website_html_${{ github.sha }}
           path: build/*