fix android config

android/app/build.gradle

@@ -31,7 +31,11 @@ if (keystorePropertiesFile.exists()) {
 }
 
 android {
-    compileSdkVersion 30
+    lintOptions {
+        checkReleaseBuilds false
+    }
+
+    compileSdkVersion 31
 
     defaultConfig {
         minSdkVersion 21
@@ -89,6 +93,7 @@ flutter {
 
 dependencies {
   implementation 'com.android.support:multidex:1.0.3'
+  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }
 
 apply plugin: 'com.google.gms.google-services'

android/build.gradle

@@ -1,4 +1,6 @@
 buildscript {
+    ext.kotlin_version = '1.6.10'
+
     repositories {
         google()
         jcenter()
@@ -7,6 +9,7 @@ buildscript {
     dependencies {
         classpath 'com.android.tools.build:gradle:4.1.0'
         classpath 'com.google.gms:google-services:4.3.8'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }
 
@@ -26,3 +29,5 @@ subprojects {
 task clean(type: Delete) {
     delete rootProject.buildDir
 }
+
+apply plugin: 'com.google.gms.google-services'