Added new default Kubernetes version to changelog

Author: davidumea

changelog/2.26.0.md

@@ -17,6 +17,7 @@ Released 2024-11-08
 ### Other(s)
 
 - [7e5c199](https://github.com/elastisys/compliantkubernetes-kubespray/commit/7e5c199d2419236ee4ffcf99a3710e02f6638dc8) - Updated Kubespray fork to v2.26.0-ck8s1 @davidumea
+  - Default Kubernetes version upgraded to `v1.30.4`.
 - [c13cc10](https://github.com/elastisys/compliantkubernetes-kubespray/commit/c13cc10528b8b46cf2caf97122a180a647d069ab) - Added migration document for v2.26 @davidumea
 - [#372](https://github.com/elastisys/compliantkubernetes-kubespray/pull/372) - clean-up: Remove some Infra Providers from release template issue @lucianvlad
 - [#373](https://github.com/elastisys/compliantkubernetes-kubespray/pull/373) - clean-up: Lucian/remove some Infra Providers from the release template @lucianvlad