Add changelog for release v0.42.4

Author: lunkan93

changelog/0.42.md

@@ -116,3 +116,13 @@ Released 2025-03-25
 ### Improvement(s)
 
 - [#2477](https://github.com/elastisys/compliantkubernetes-apps/pull/2477) - Upgrade ingress-nginx chart to v4.12.1 [@anders-elastisys](https://github.com/anders-elastisys)
+
+## v0.42.4
+
+Released 2025-03-28
+
+## Changes by kind
+
+### Other(s)
+
+- [#2447](https://github.com/elastisys/compliantkubernetes-apps/pull/2447) - Expose fluentd-forwarder image config [@lunkan93](https://github.com/lunkan93)