Bump actions/download-artifact from 3 to 4

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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -117,7 +117,7 @@ jobs:
         with:
           python-version: ${{env.PYTHON_LATEST}}
       - run: python -m pip install --upgrade coverage[toml]
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           name: coverage-data
       - name: Combine coverage & fail if it's <70%.