Bump actions/download-artifact from 3.0.2 to 4.1.8

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3.0.2 to 4.1.8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3.0.2...v4.1.8)

---
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/tests.yml

@@ -126,7 +126,7 @@ jobs:
           nox --version
 
       - name: Download coverage data
-        uses: actions/download-artifact@v3.0.2
+        uses: actions/download-artifact@v4.1.8
         with:
           name: coverage-data