Bump actions/download-artifact from 3 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
...

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Author: dependabot[bot]

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

@@ -203,7 +203,7 @@ jobs:
         ref: ${{ github.event.pull_request.head.sha }}
 
     - name: Retrieve RootCA/PubKey
-      uses: actions/download-artifact@v3
+      uses: actions/download-artifact@v4.1.7
       with:
         name: Certs
         path: ${{env.cert_path}}