Update download-artifact action to v4

Author: patacca

.github/workflows/release.yml

@@ -29,7 +29,7 @@ jobs:
     needs: build_wheel_and_sdist
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
         with:
           # unpacks default artifact into dist/
           # if `name: artifact` is omitted, the action will create extra parent dir