chore: changelog (#771)

Author: dervoeti

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## [Unreleased]
 
+### Added
+
+- Support setting `clientAuthenticationMethod` for OIDC authentication. The value is passed through to the Flask-AppBuilder config as `token_endpoint_auth_method` ([#765]).
+
 ### Changed
 
 - Document Helm deployed RBAC permissions and remove unnecessary permissions ([#767]).
@@ -10,8 +14,9 @@
 
 - Do not use immutable Secret objects for internal secrets. Migrate existing secrets to mutable versions ([#770]).
 
-- [#767]: https://github.com/stackabletech/airflow-operator/pull/767
-- [#770]: https://github.com/stackabletech/airflow-operator/pull/770
+[#765]: https://github.com/stackabletech/airflow-operator/pull/765
+[#767]: https://github.com/stackabletech/airflow-operator/pull/767
+[#770]: https://github.com/stackabletech/airflow-operator/pull/770
 
 ## [26.3.0] - 2026-03-16