Removed the legacy support lib (#5389)

lib/android/app/build.gradle

 dependencies {
     implementation 'androidx.appcompat:appcompat:1.0.2'
     implementation 'androidx.annotation:annotation:1.1.0'
-    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
     implementation 'com.google.android.material:material:1.1.0-alpha08'
 
     implementation 'com.github.wix-playground:ahbottomnavigation:3.0.2'