CI: Bump actions/download-artifact from 7 to 8 (#1979)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 7 to 8.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](https://github.com/actions/download-artifact/compare/v7...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/sop-test-suite.yml

@@ -81,7 +81,7 @@ jobs:
         uses: actions/checkout@v6
       - name: Download test results json artifact
         id: download-test-results
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           name: test-suite-results.json
       - name: Compare with baseline