Bump iOS to beta 4

Author: emawby

example/ios/Podfile

@@ -32,7 +32,7 @@ target 'Runner' do
 end
 
 target 'OneSignalNotificationServiceExtension' do
-  pod 'OneSignalXCFramework', '5.0.0-beta-03'
+  pod 'OneSignalXCFramework', '5.0.0-beta-04'
 end
 
 post_install do |installer|

ios/onesignal_flutter.podspec

@@ -13,7 +13,7 @@ Pod::Spec.new do |s|
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
-  s.dependency 'OneSignalXCFramework', '5.0.0-beta-03'
+  s.dependency 'OneSignalXCFramework', '5.0.0-beta-04'
   s.ios.deployment_target = '11.0'
   s.static_framework = true
 end