title: mavenCentral() is not working instead jcenter()
body: <p>mavenCentral() is not working instead jcenter(). When I use mavenCentral() I am getting below error message,</p>
  <pre><code>Could not HEAD 'https://google.bintray.com/flexbox-layout/com/google/android/flexbox/2.0.1/flexbox-2.0.1.pom'. Received status code 403 from server: Forbidden
  Disable Gradle 'offline mode' and sync project
  </code></pre>
  <p>With jcenter() above error is not coming.</p>
  <blockquote>
  <p>Can I use jcenter() in my project even after jcenter() is deprecated. What is the last date of  jcenter() to be use in our project.</p>
  </blockquote>
  <p><strong>Project build.gradle</strong></p>
  <pre><code>// Top-level build file where you can add configuration options common to all sub-projects/modules.
  
  buildscript {
  
      repositories {
          google()
          mavenCentral()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle:3.4.3'
          classpath 'com.google.gms:google-services:4.3.8'
          //classpath &quot;org.jfrog.buildinfo:build-info-extractor-gradle:4.24.4&quot;
      }
  }
  
  allprojects {
      /*apply plugin: 'com.jfrog.artifactory'
      apply plugin: 'maven-publish'*/
  
      repositories {
          google()
          mavenCentral()
      }
  }
  </code></pre>
  <p><strong>Module build.gradle</strong></p>
  <pre><code>apply plugin: 'com.android.application'
  
  android {
      compileSdkVersion 30
      defaultConfig {
          applicationId &quot;io.kommunicate.app&quot;
          minSdkVersion 16
          targetSdkVersion 30
          versionCode 1
          versionName &quot;1.0&quot;
          testInstrumentationRunner &quot;androidx.test.runner.AndroidJUnitRunner&quot;
  
            //Sensitive data
      }
  
      buildTypes {
          release {
              minifyEnabled false
              shrinkResources false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
          debug {
              minifyEnabled false
              shrinkResources false
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  allprojects {
      repositories {
          google()
          mavenCentral()
          //jcenter()
      }
  }
  
  dependencies {
      implementation fileTree(include: ['*.jar'], dir: 'libs')
      //api project(':kommunicateui')
      implementation 'io.kommunicate.sdk:kommunicateui:2.1.8'
      implementation 'androidx.appcompat:appcompat:1.1.0'
      implementation 'androidx.multidex:multidex:2.0.1'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'androidx.test:runner:1.2.0'
      androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
  }
  
  apply plugin: 'com.google.gms.google-services'
  </code></pre>