docs: update changelogs

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [v1.5.5](https://github.com/nocobase/nocobase/compare/v1.5.4...v1.5.5) - 2025-02-11
+
+### 🚀 Improvements
+
+- **[Notification: In-app message]** Add test for retrieving latest message title and timestamp in in-app channels. ([#6189](https://github.com/nocobase/nocobase/pull/6189)) by @sheldon66
+
 ## [v1.5.4](https://github.com/nocobase/nocobase/compare/v1.5.3...v1.5.4) - 2025-02-10
 
 ### 🚀 Improvements

CHANGELOG.zh-CN.md

@@ -5,6 +5,12 @@
 格式基于 [Keep a Changelog](https://keepachangelog.com/zh-CN/1.0.0/),
 并且本项目遵循 [语义化版本](https://semver.org/spec/v2.0.0.html)。
 
+## [v1.5.5](https://github.com/nocobase/nocobase/compare/v1.5.4...v1.5.5) - 2025-02-11
+
+### 🚀 优化
+
+- **[通知：站内信]** 增加在站内信渠道中获取最新消息标题和最新接收时间的测试用例。 ([#6189](https://github.com/nocobase/nocobase/pull/6189)) by @sheldon66
+
 ## [v1.5.4](https://github.com/nocobase/nocobase/compare/v1.5.3...v1.5.4) - 2025-02-10
 
 ### 🚀 优化