Bump actions/download-artifact from 4 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -215,7 +215,7 @@ jobs:
     - name: Tune GitHub-hosted runner network
       uses: smorimoto/tune-github-hosted-runner-network@v1
     - name: Download artifacts
-      uses: actions/download-artifact@v4
+      uses: actions/download-artifact@v6
     - name: Publish to GitHub Packages
       if: ${{ github.event_name == 'push' || github.event_name == 'release' }}
       run: |