Bump actions/download-artifact from 5 to 6 (#582)

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

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/continuous-integration.yml

@@ -86,7 +86,7 @@ jobs:
           fetch-depth: 2
 
       - name: "Download coverage files"
-        uses: "actions/download-artifact@v5"
+        uses: "actions/download-artifact@v6"
         with:
           path: "reports"