update dependency for ios and android

Author: luckyyuqiang

im_flutter_sdk_android/android/build.gradle

@@ -47,6 +47,6 @@ tasks.withType(JavaCompile){
 dependencies {
     api 'androidx.appcompat:appcompat:1.1.0'
     // implementation 'cn.shengwang:chat-sdk:1.3.2'
-    implementation 'io.hyphenate:hyphenate-chat:4.15.1'
+    implementation 'io.hyphenate:hyphenate-chat:4.16.1'
     implementation fileTree(dir: 'libs', include: ['*.jar'])
 }

im_flutter_sdk_ios/ios/im_flutter_sdk_ios.podspec

@@ -17,7 +17,7 @@ A new flutter plugin project.
   s.public_header_files = 'Classes/**/*.h'
 
   s.dependency 'Flutter'
-  s.dependency 'HyphenateChat','4.15.1'
+  s.dependency 'HyphenateChat','4.16.2'
   # s.dependency 'ShengwangChat_iOS','1.3.2'
   # 注释掉本地 framework，使用 CocoaPods 依赖
   # s.ios.vendored_frameworks = 'framework/HyphenateChat.xcframework', 'framework/aosl.xcframework'