bump to 3.13.0

CHANGELOG.md

+# 3.13.0
+* Android SDK升级到6.8.24
+* Kotlin升级到1.7.10
+* iOS切换到WechatOpenSDK-XCFramework
+
 # 3.12.2
 * Fix #509
 

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: 3.12.2
+version: 3.13.0
 homepage: https://github.com/JarvanMo/fluwx
 
 environment: