Update Android gradle plugin

app/build.gradle

@@ -25,10 +25,6 @@ android {
     applicationVariants.all { variant ->
         variant.resValue "string", "app_id", variant.applicationId
     }
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
     lintOptions {
         disable 'MissingTranslation'
     }

build.gradle

@@ -4,7 +4,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.3'
+        classpath 'com.android.tools.build:gradle:4.2.1'
         classpath 'org.greenrobot:greendao-gradle-plugin:3.3.0'
     }
 }