fix(android): update build tools

examples/basic/android/build.gradle

@@ -2,10 +2,10 @@
 
 buildscript {
     ext {
-    buildToolsVersion = "28.0.3"
+        buildToolsVersion = "29.0.2"
         minSdkVersion = 16
-    compileSdkVersion = 28
-    targetSdkVersion = 28
+        compileSdkVersion = 31
+        targetSdkVersion = 29
         supportLibVersion = "28.0.0"
 
 }
@@ -14,7 +14,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.1'
+        classpath 'com.android.tools.build:gradle:4.0.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

examples/basic/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.1.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip