Fixes gradle error: 'Could not find lint-gradle-api.jar' (#23095) (#23397)

* Fixes gradle error: 'Could not find lint-gradle-api.jar' (#23095)

AUTHORS

@@ -28,3 +28,4 @@ Christian Mürtz <teraarts@t-online.de>
 Lukasz Piliszczuk <lukasz@intheloup.io>
 Felix Schmidt <felix.free@gmx.de>
 Artur Rymarz <artur.rymarz@gmail.com>
+Stefan Mitev <mr.mitew@gmail.com>

packages/flutter_tools/gradle/flutter.gradle

@@ -18,10 +18,8 @@ import org.gradle.api.tasks.bundling.Jar
 
 buildscript {
     repositories {
+        google()
         jcenter()
-        maven {
-            url 'https://dl.google.com/dl/android/maven2'
-        }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:3.2.1'