Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 2 to 4.1.7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v2...v4.1.7)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/test.yml

@@ -704,19 +704,19 @@ jobs:
           pip3 install toml
           gcc --version
           python3 --version
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         if: ${{github.event_name == 'pull_request'}}
         continue-on-error: true
         with:
           name: sizes
           path: sizes
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         if: ${{github.event_name == 'pull_request'}}
         continue-on-error: true
         with:
           name: cov
           path: cov
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v4.1.7
         if: ${{github.event_name == 'pull_request'}}
         continue-on-error: true
         with: