Update CHANGELOG.md

Author: simukappu

CHANGELOG.md

@@ -10,16 +10,16 @@ Enhancements:
 ## 2.4.1 / 2025-12-31
 [Full Changelog](http://github.com/simukappu/activity_notification/compare/v2.4.0...v2.4.1)
 
-Enhancements:
-
-* Make Mongoid and Dynamoid optional dependencies - [#190](https://github.com/simukappu/activity_notification/issues/190)
-
 Bug Fixes:
 
 * Fix OpenAPI schema validation errors in Subscription model
 * Fix Dynamoid ORM datetime format issue in optional_targets API response
 * Fix OpenAPI parser deprecation warning by adding strict_reference_validation configuration
 
+Dependency:
+
+* Make Mongoid and Dynamoid optional dependencies - [#190](https://github.com/simukappu/activity_notification/issues/190)
+
 ## 2.4.0 / 2025-08-20
 [Full Changelog](http://github.com/simukappu/activity_notification/compare/v2.3.3...v2.4.0)