Bump actions/download-artifact from 4 to 7

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -54,7 +54,7 @@ jobs:
     if: "startsWith(github.ref, 'refs/tags/')"
     needs: [ macos, windows, linux ]
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v7
         with:
           name: wheels
       - name: Publish to PyPI