Bump actions/download-artifact from 4.1.8 to 4.1.9

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4.1.8 to 4.1.9.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4.1.8...v4.1.9)

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

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

.github/workflows/ci.yml

@@ -142,7 +142,7 @@ jobs:
         ruby-version: 3.4
         bundler-cache: true
     - name: Download coverage results
-      uses: actions/download-artifact@v4.1.8
+      uses: actions/download-artifact@v4.1.9
     - name: Collate simplecov
       run: |
         bundle exec rake coverage:report