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

Author: renovate[bot]

.github/workflows/docker.yaml

@@ -64,7 +64,7 @@ jobs:
     needs: build
     steps:
       - name: Download digests
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: /tmp/digests
           pattern: digests-*