Upgrade the example app to react-native v19 for iOS

Author: BartoszKlonowski

example/Gemfile

@@ -7,3 +7,10 @@ ruby ">= 2.6.10"
 gem 'cocoapods', '>= 1.13', '!= 1.15.0', '!= 1.15.1'
 gem 'activesupport', '>= 6.1.7.5', '!= 7.1.0'
 gem 'xcodeproj', '< 1.26.0'
+gem 'concurrent-ruby', '< 1.3.4'
+ 
+# Ruby 3.4.0 has removed some libraries from the standard library.
+gem 'bigdecimal'
+gem 'logger'
+gem 'benchmark'
+gem 'mutex_m'

example/ios/Podfile

@@ -23,11 +23,6 @@ target 'example' do
     :app_path => "#{Pod::Config.instance.installation_root}/.."
   )
 
-  target 'exampleTests' do
-    inherit! :complete
-    # Pods for testing
-  end
-
   post_install do |installer|
     # https://github.com/facebook/react-native/blob/main/packages/react-native/scripts/react_native_pods.rb#L197-L202
     react_native_post_install(