优化：移除multidex

注：Android 5.0（api21）开始，默认支持multidex，不需要手动接入multidex

app/build.gradle

@@ -45,7 +45,6 @@ android {
         versionName version
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         project.ext.set("archivesBaseName", name + "_" + version)
-        multiDexEnabled true
 
         buildConfigField "String", "Cronet_Version", "\"$CronetVersion\""
         buildConfigField "String", "Cronet_Main_Version", "\"$CronetMainVersion\""
@@ -133,7 +132,6 @@ dependencies {
     testImplementation('junit:junit:4.13.2')
     androidTestImplementation('androidx.test:runner:1.5.2')
     androidTestImplementation('androidx.test.espresso:espresso-core:3.5.1')
-    implementation('androidx.multidex:multidex:2.0.1')
     //kotlin
     //noinspection GradleDependency,DifferentStdlibGradleVersion
     implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version")