upgrade android gradle plugin to 4.2.1 (#2160)

* upgrade android gradle plugin to 4.2.1

* upgrade android gradle plugin to 4.2.1

app/build.gradle

@@ -34,7 +34,6 @@ android {
         kapt {
             arguments {
                 arg("room.schemaLocation", "$projectDir/schemas")
-                arg("room.incremental", "true")
             }
         }
     }
@@ -60,10 +59,6 @@ android {
     lintOptions {
         disable 'MissingTranslation'
     }
-    compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
-    }
     buildFeatures {
         viewBinding true
     }
@@ -88,11 +83,8 @@ android {
             enableSplit = false
         }
     }
-}
-
-project.tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
     kotlinOptions {
-        jvmTarget = "1.8"
+        jvmTarget = '1.8'
     }
 }
 

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.2'
+        classpath 'com.android.tools.build:gradle:4.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }