Bump gradle from 4.1.3 to 4.2.0 (#2293)

Summary:
Bumps gradle from 4.1.3 to 4.2.0.

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Pull Request resolved: https://github.com/facebook/flipper/pull/2293

Reviewed By: passy

Differential Revision: D28323838

Pulled By: cekkaewnumchai

fbshipit-source-id: 260e664a4abb9c9acbb45ecdff734c16ab6c8596

build.gradle

@@ -11,7 +11,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.1.3'
+        classpath 'com.android.tools.build:gradle:4.2.0'
         classpath 'com.vanniktech:gradle-maven-publish-plugin:0.15.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$KOTLIN_VERSION"
         classpath "org.jetbrains.dokka:dokka-gradle-plugin:1.4.32"