Update iOS SDK to 5.5.1

Author: github-actions[bot]

react-native-onesignal.podspec

@@ -15,5 +15,5 @@ Pod::Spec.new do |s|
 
   install_modules_dependencies(s)
 
-  s.dependency 'OneSignalXCFramework', '5.5.0'
+  s.dependency 'OneSignalXCFramework', '5.5.1'
 end