Could Not build Flutter Android Build : Received status code 502 from bintray

Question

Hi I am trying to run my flutter app debug. I last opened this app on November 3rd week but Today when I build the app debug I am facing below exception. I've been told that bintray has been sunset, but confused as how to replace/update my gradle.

FAILURE: Build failed with an exception.

* What went wrong:
Could not determine the dependencies of task ':app:preDebugBuild'.
> Could not resolve all task dependencies for configuration ':app:debugRuntimeClasspath'.
   > Could not resolve com.onesignal:OneSignal:[3.11.2,3.99.99].
     Required by:
         project :app
      > Failed to list versions for com.onesignal:OneSignal.
         > Unable to load Maven meta-data from https://google.bintray.com/exoplayer/com/onesignal/OneSignal/maven-metadata.xml.
            > Could not get resource 'https://google.bintray.com/exoplayer/com/onesignal/OneSignal/maven-metadata.xml'.
               > Could not GET 'https://google.bintray.com/exoplayer/com/onesignal/OneSignal/maven-metadata.xml'. Received status code 502 from server: Bad Gateway

* Try:
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* Get more help at https://help.gradle.org

BUILD FAILED in 18s
Exception: Gradle task assembleDebug failed with exit code 1

These are my Flutter and Dart Versions:

• Flutter 1.17.5
• Dart Dart 2.8.4

OneSignal Plugin

onesignal_flutter: ^2.6.4

Distribution URL in gradle.properties:

distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip

Project Level Gradle:

buildscript {
    repositories {
        google()
        mavenCentral()
//        jcenter()
        maven {
           url 'https://maven.fabric.io/public'
        }
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:4.0.1'
        classpath 'com.google.gms:google-services:3.2.1'   // new
        classpath 'io.fabric.tools:gradle:1.+'
    }

    // #jf1dt support multidex + androidX
    subprojects {
        project.configurations.all {
            resolutionStrategy.eachDependency { details ->
                if (details.requested.group == 'com.android.support'
                        && !details.requested.name.contains('multidex') ) {
                    details.useVersion "27.1.1"
                }

                if (details.requested.group == 'androidx.core'
                        && !details.requested.name.contains('androidx') ) {
                    details.useVersion "1.0.1"
                }
            }
        }
    }
}

allprojects {
    repositories {
        mavenCentral()
        google()
//        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}