bump to 5.2.4

CHANGELOG.md

+# 5.2.4
+* Fix #663
+
 # 5.2.3
 * Fix #661
 

pubspec.yaml

 name: fluwx
 description: The capability of implementing WeChat SDKs in Flutter. With Fluwx, developers can use WeChatSDK easily, such as sharing, payment, lanuch mini program and etc.
-version: 5.2.3
+version: 5.2.4
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: