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](https://github.com/actions/download-artifact/compare/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] <support@github.com>

.github/workflows/build-python-packages.yml

@@ -130,7 +130,7 @@ jobs:
         run: if [ -d /Library/Frameworks/Python.framework ]; then sudo rm -rf /Library/Frameworks/Python.framework; fi
 
       - name: Download artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: ${{ env.ARTIFACT_NAME }}
           path: ${{ runner.temp }}/${{ env.ARTIFACT_NAME }}
@@ -199,7 +199,7 @@ jobs:
       needs: test_python
       runs-on: ubuntu-latest
       steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v6
 
       - name: Publish Release ${{ env.VERSION }}
         id: create_release