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]
 
+### Removed
+
+- Reverted support for specifying a `clientAuthenticationMethod` for OIDC ([#1170]).
+  It can be added back afer the SDP release.
+
+[#1170]: https://github.com/stackabletech/operator-rs/pull/1170
+
 ## [0.107.1] - 2026-03-10
 
 ### Added