chore(deps): update actions/download-artifact action to v8

Author: renovate[bot]

.github/workflows/allocator-bench.yml

@@ -82,7 +82,7 @@ jobs:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
         with:
           persist-credentials: false
-      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           path: artifacts
           pattern: bench-*