chore: Update changelog

Author: NickLarsenNZ

crates/stackable-operator/CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+### Added
+
+- Add support for specifying a `clientAuthenticationMethod` for OIDC ([#1178]).
+  This was originally done in [#1158] and had been reverted in [#1170].
+
+[#1178]: https://github.com/stackabletech/operator-rs/pull/1178
+
 ## [0.108.0] - 2026-03-10
 
 ### Removed