Bump actions/download-artifact from 4 to 8 (#503)

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
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Maximilian <maximilian.muschalik@gmail.com>

Author: dependabot[bot]

.github/workflows/python-publish.yml

@@ -27,12 +27,12 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v8
         with:
           pattern: wheels-*
           path: dist/
           merge-multiple: true
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v8
         with:
           name: sdist
           path: dist/