Upgrade gradle plugin

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.0.0-beta05'
+        classpath 'com.android.tools.build:gradle:7.0.2'
         classpath 'com.google.gms:google-services:4.3.8'
         classpath 'com.google.firebase:firebase-crashlytics-gradle:2.7.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"