Bump dawidd6/action-download-artifact from 14 to 15 (#805)

Author: dependabot[bot]

.github/workflows/benchmark-comment.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: actions/checkout@v6
 
       # restore records from the artifacts
-      - uses: dawidd6/action-download-artifact@v14
+      - uses: dawidd6/action-download-artifact@v15
         with:
           workflow: benchmark.yml
           name: performance-tracking