⬆ Bump actions/download-artifact from 6 to 8 (#163)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/smokeshow.yml

@@ -23,7 +23,7 @@ jobs:
 
       - run: pip install smokeshow
 
-      - uses: actions/download-artifact@v6
+      - uses: actions/download-artifact@v8
         with:
           name: coverage-html
           path: htmlcov

.github/workflows/test.yml

@@ -101,7 +101,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v7
       - name: Get coverage files
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v8
         with:
           pattern: coverage-*
           path: coverage