iOS fixes for the new on-device MLKit

Author: danhunsaker

example/ios/Podfile

@@ -29,9 +29,8 @@ flutter_ios_podfile_setup
 
 target 'Runner' do
   flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
-# because of issue https://github.com/FirebaseExtended/flutterfire/issues/4625#issuecomment-821792539
-# need custom git version until it's done
-  pod 'FirebaseMLVisionBarcodeModel', '0.21', :source => 'git@github.com:rozdonmobile/CocoaPodsSpecs.git'
+
+  pod 'GoogleMLKit/BarcodeScanning', '~> 2.2.0'
 end
 
 post_install do |installer|