bump 5o 4.5.2

CHANGELOG.md

+# 4.5.2
+* Android WechatSdk->6.8.28
+* iOS WeChatSdk->2.0.4
+
 # 4.5.1
 * Merge #602: 增加iOS privacy manifest
 

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: 4.5.1
+version: 4.5.2
 homepage: https://github.com/OpenFlutter/fluwx
 
 environment: