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](https://github.com/actions/download-artifact/compare/v3...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/ci.yml

@@ -179,7 +179,7 @@ jobs:
           cp ./docs/resources/secure-bridge.conflist ./cni/secure-bridge.conflist
           echo "server { default_scheduler_config { memory_oversubscription_enabled = true } }, client { cni_path = \"${{ github.workspace }}/cni/bin\", cni_config_dir = \"${{ github.workspace }}/cni\" }" > e2e-config.hcl
       - name: Download Poseidon binary
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: poseidon
       - name: Get current branch name