Update actions/upload-pages-artifact action to v5 (#4112)

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

Author: renovate[bot]

.github/workflows/docs.yml

@@ -23,7 +23,7 @@ jobs:
         working-directory: docs
       - run: zensical build --clean
         working-directory: docs
-      - uses: actions/upload-pages-artifact@v4
+      - uses: actions/upload-pages-artifact@v5
         with:
           path: docs/site
       - uses: actions/deploy-pages@v5