💚 Fix android build issue for the example

Author: AlexV525

example/android/app/build.gradle

@@ -27,7 +27,7 @@ apply plugin: 'kotlin-kapt'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
@@ -41,7 +41,7 @@ android {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.fluttercandies.wechat_camera_picker_demo"
         minSdkVersion 21
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }