fixed deployment warning

Author: veenstrajelmer

.github/workflows/sphinx-docs.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Sphinx build
         run: |
           sphinx-build docs docs/_build
-      - uses: actions/upload-pages-artifact@v1
+      - uses: actions/upload-pages-artifact@v4
         with:
           path: docs/_build/