Bump actions/download-artifact from 7 to 8 (#567)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...v8)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '8'
  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/ci.yml

@@ -45,7 +45,7 @@ jobs:
           # Sonar analysis needs the full history for features like automatic assignment of bugs. If the following step
           # is not included the project will show a warning about incomplete information.
           fetch-depth: 0
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           name: code-coverage-ubuntu-latest-24.x
           path: coverage/