fix: android build failure. (#587)

Author: cloudwebrtc

android/build.gradle

@@ -25,7 +25,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
 
     namespace 'io.livekit.plugin'
 

example/android/build.gradle

@@ -12,15 +12,6 @@ buildscript {
 }
 
 allprojects {
-    afterEvaluate { project ->
-        if (project.plugins.hasPlugin("com.android.application") ||
-                project.plugins.hasPlugin("com.android.library")) {
-            project.android {
-                compileSdkVersion 34
-                buildToolsVersion "34.0.0"
-            }
-        }
-    }
     repositories {
         google()
         jcenter()