Add changelog for release v0.42.3

Author: Ajarmar

changelog/0.42.md

@@ -101,3 +101,18 @@ Released 2025-03-11
 ### Deprecation(s)
 
 - [#2457](https://github.com/elastisys/compliantkubernetes-apps/pull/2457) - Remove rbac for additional fluentd config and plugins configmaps [@OlleLarsson](https://github.com/OlleLarsson)
+
+## v0.42.3
+
+Released 2025-03-25
+
+> [!WARNING]
+> **Security Notice(s)**
+>
+> - Ingress-nginx upgraded to address the following CVEs:<br>CVE-2025-24513<br>CVE-2025-24514<br>CVE-2025-1097<br>CVE-2025-1098<br>CVE-2025-1974
+
+## Changes by kind
+
+### 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)