Bump dawidd6/action-download-artifact from 2 to 6 in /.github/workflows (#561)

Bumps [dawidd6/action-download-artifact](https://github.com/dawidd6/action-download-artifact) from 2 to 6.
- [Release notes](https://github.com/dawidd6/action-download-artifact/releases)
- [Commits](dawidd6/action-download-artifact@v2...v6)

---
updated-dependencies:
- dependency-name: dawidd6/action-download-artifact
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/benchmark-comment.yml

@@ -26,7 +26,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       # restore records from the artifacts
-      - uses: dawidd6/action-download-artifact@v2
+      - uses: dawidd6/action-download-artifact@v6
         with:
           workflow: benchmark.yml
           name: Benchmarking