imp: upgrade compileSdkVersion of plugin

android/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
 
     sourceSets {
         main.java.srcDirs += 'src/main/kotlin'
@@ -33,6 +33,7 @@ android {
     defaultConfig {
         // minSdkVersion is determined by Native View.
         minSdkVersion 20
+        targetSdkVersion 31
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         multiDexEnabled true
     }