Set download-artifact version to 4.1.8

Fix CVE-2024-42471

Author: arey

.github/workflows/main.yml

@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v4.1.8
         name: Download benchmarks
         with:
           pattern: benchmark_results_*