Bump actions/download-artifact from 3 to 4 (#118)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/nightly.yaml

@@ -103,7 +103,7 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: "3.x"
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4
       with:
         path: /tmp/workspace/logs
     - name: Move all log files into a single directory