Merge pull request #153 from emersion/upgrade

example: fix build

Author: p1gp1g

example/android/app/build.gradle

@@ -30,7 +30,7 @@ kotlin {
 }
 
 android {
-    compileSdk 34
+    compileSdk flutter.compileSdkVersion
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
@@ -39,8 +39,8 @@ android {
 
     defaultConfig {
         applicationId "org.unifiedpush.flutter.example"
-        minSdk 16
-        targetSdk 34
+        minSdk flutter.minSdkVersion
+        targetSdk flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
         // Required when setting minSdkVersion to 20 or lower