chore: Bump actions/download-artifact from 3.0.2 to 4.1.4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3.0.2 to 4.1.4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@9bc31d5...c850b93)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/run-syne-tune.yml

@@ -67,7 +67,7 @@ jobs:
         run: python -m pip install -e '.[${{ inputs.extras-require }}]'
       - name: Download artifact (must have been previously uploaded via actions/upload-artifact)
         if: ${{ inputs.download-artifact-path != '' }}
-        uses: actions/download-artifact@9bc31d5ccc31df68ecc42ccf4149144866c47d8a # v3.0.2
+        uses: actions/download-artifact@c850b930e6ba138125429b7e5c93fc707a7f8427 # v4.1.4
         with:
           name: ${{ inputs.download-artifact-name }}
           path: ${{ inputs.download-artifact-path }}