feat(chart): add missing changelog for kubernetes-sigs#5493 (kubernetes-sigs#5541)

Author: vflaux

charts/external-dns/CHANGELOG.md

@@ -18,6 +18,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [UNRELEASED]
 
+### Changed
+
+- Update RBAC for `Service` source to support `EndpointSlices`. ([#5493](https://github.com/kubernetes-sigs/external-dns/pull/5493)) _@vflaux_
+
 ## [v1.17.0] - 2025-06-04
 
 ### Changed