release: use download-action v4 in docker section (#1134)

We missed this upgrade in #1047

.github/workflows/release.yml

@@ -128,7 +128,7 @@ jobs:
 
       - name: Download artifacts
         if: ${{ env.HAS_DOCKER_CREDS == 'true' }}
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: linux-latest
           path: artifacts