Remove usages of jcenter() Maven repository

This repository is deprecated and it will be shut down in the future.
See http://developer.android.com/r/tools/jcenter-end-of-service for more information.

JCenter will be able to resolve dependencies until February 1, 2022 without changes.
After that date, there are no guarantees that you will be able to build your software
if you continue to use JCenter.
See https://blog.gradle.org/jcenter-shutdown for more information.

Change-Id: I9bc875e0b9380a254d91481860f5efb4281c0840

build.gradle

@@ -9,8 +9,6 @@ buildscript {
 
     repositories {
         mavenCentral()
-        //noinspection JcenterRepositoryObsolete
-        jcenter()
         google()
     }
     dependencies {
@@ -33,8 +31,6 @@ apply from: 'gradle/dependencies.gradle'
 allprojects {
     repositories {
         mavenCentral()
-        //noinspection JcenterRepositoryObsolete
-        jcenter()
         google()
         maven { url 'https://jitpack.io' }
     }