⬆ Bump actions/download-artifact from 5 to 6 (#1621)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  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>

.github/workflows/deploy-docs.yml

@@ -49,7 +49,7 @@ jobs:
         run: |
           rm -rf ./site
           mkdir ./site
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           path: ./site/
           pattern: docs-site

.github/workflows/smokeshow.yml

@@ -29,7 +29,7 @@ jobs:
             requirements**.txt
             pyproject.toml
       - run: uv pip install -r requirements-github-actions.txt
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: coverage-html
           path: htmlcov

.github/workflows/test.yml

@@ -115,7 +115,7 @@ jobs:
             requirements**.txt
             pyproject.toml
       - name: Get coverage files
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: coverage-*
           path: coverage