Add #4058 to the release notes

release notes/v0.56.0.md

@@ -37,6 +37,7 @@ _Format as `<number> <present_verb> <object>. <credit>`_:
 - [browser#1542](https://github.com/grafana/xk6-browser/pull/1542) Fixes a panic which can occur when a frame navigates.
 - [browser#1547](https://github.com/grafana/xk6-browser/pull/1547) Fixes a panic due to events associated to stale frames.
 - [browser#1544](https://github.com/grafana/xk6-browser/pull/1544) Fixes a nil pointer dereference when calling `evaluate` or `evaluateHandle` with an invalid page function.
+- [#4058](https://github.com/grafana/k6/pull/4058) Fixes the namespaced object export when default is the only one available.
 
 ## Maintenance and internal improvements