chore(deps): bump actions/download-artifact from 4 to 8

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v4...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>

.github/workflows/sonarqube.yml

@@ -152,17 +152,17 @@ jobs:
         with:
           fetch-depth: 0
       - name: Téléchargement du rapport de couverture (Front)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: frontend-coverage
           path: apps/frontend/coverage/frontend
       - name: Téléchargement du rapport de couverture (Back)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: backend-coverage
           path: apps/backend
       - name: Téléchargement du rapport de couverture (ML)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: ml-coverage
           path: ml