Build(deps): Bump actions/download-artifact from 6 to 8

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/release-python.yml

@@ -132,7 +132,7 @@ jobs:
     if: "startsWith(github.ref, 'refs/tags/')"
     needs: [linux, windows, macos, sdist]
     steps:
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v8
       - name: Publish to PyPI
         uses: PyO3/maturin-action@v1
         env: