upgrade compileSdkVersion & add namespace

Author: Rushabhshroff

example/android/app/build.gradle

@@ -25,12 +25,12 @@ apply plugin: 'com.android.application'
 apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
 
 android {
-    compileSdkVersion 31
-
+    compileSdkVersion 35
+    namespace "com.browserstack.fluttersystemproxy.flutter_system_proxy_example"
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.browserstack.fluttersystemproxy.flutter_system_proxy_example"
-        minSdkVersion 16
+        minSdkVersion flutter.minSdkVersion
         targetSdkVersion 30
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName