Revert "Bump actions/download-artifact from 4 to 5 (#100)"

This reverts commit 4d35d6f.

Author: bkoelman

.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@v5
+      uses: actions/download-artifact@v4
     - name: Publish to GitHub Packages
       if: ${{ github.event_name == 'push' || github.event_name == 'release' }}
       run: |