Bump actions/download-artifact from 4 to 8 (#42)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v8)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/publish.yml

@@ -34,6 +34,6 @@ jobs:
       id-token: write
     steps:
     - name: Retrieve packages
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v8
     - name: Upload packages
       uses: pypa/gh-action-pypi-publish@release/v1