Bump actions/download-artifact from 4 to 8 (#12)

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

@@ -121,7 +121,7 @@ jobs:
           key: ${{ runner.os }}-php8.3-composer-${{ hashFiles('composer.json') }}
           restore-keys: ${{ runner.os }}-php8.3-composer-
       - run: composer install --prefer-dist --no-progress
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v8
         with:
           name: coverage
           path: coverage/