Update actions/download-artifact action to v8 (master) (#426)

Author: renovate-rancher[bot]

.github/workflows/release.yaml

@@ -111,7 +111,7 @@ jobs:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - name: Download assets
-        uses: actions/download-artifact@d3f86a106a0bac45b974a628896c90dbdf5c8093 # v4
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           path: /tmp/assets
           pattern: rancher-machine-*.tar.gz