Bump actions/download-artifact from 3 to 4

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/push.yml

@@ -28,7 +28,7 @@ jobs:
     needs: build
     steps:
     - uses: actions/checkout@v4
-    - uses: actions/download-artifact@v3
+    - uses: actions/download-artifact@v4
       with:
         name: wasm
         path: wasm