Update actions/upload-pages-artifact action to v5 (#2865)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docs.yml

@@ -26,7 +26,7 @@ jobs:
           cd docs
           pip install zensical
           zensical build --clean
-      - uses: actions/upload-pages-artifact@v4
+      - uses: actions/upload-pages-artifact@v5
         with:
           path: docs/site
       - uses: actions/deploy-pages@v5