chore(deps): update actions/upload-artifact action to v6 (#69)

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

Author: renovate[bot]

.github/workflows/build.yaml

@@ -21,7 +21,7 @@ jobs:
           python -m pip install -e .[docs]
           sphinx-build -b html docs/ docs/_build
       - name: Upload artifact
-        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: docs
           path: docs/_build/