Update gradle versions in hello_services to those currently shipped in Android Studio (#7587)

examples/hello_services/android/build.gradle

@@ -4,7 +4,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.1.0'
+        classpath 'com.android.tools.build:gradle:2.2.3'
     }
 }
 
@@ -19,5 +19,5 @@ task clean(type: Delete) {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '2.10'
+    gradleVersion = '2.14.1'
 }

examples/hello_services/android/buildSrc/build.gradle

@@ -3,5 +3,5 @@ repositories {
 }
 
 dependencies {
-  compile "com.android.tools.build:gradle:2.1.0"
+  compile "com.android.tools.build:gradle:2.2.3"
 }