[LOCAL] Fix cherry-pick error

Looks like #46787 wasn't picked correctly.

Author: blakef

packages/react-native/scripts/cocoapods/new_architecture.rb

@@ -12,15 +12,16 @@ class NewArchitectureHelper
     @@NewArchWarningEmitted = false # Used not to spam warnings to the user.
 
     def self.set_clang_cxx_language_standard_if_needed(installer)
+        cxxBuildsettingsName = "CLANG_CXX_LANGUAGE_STANDARD"
         projects = installer.aggregate_targets
             .map{ |t| t.user_project }
             .uniq{ |p| p.path }
 
         projects.each do |project|
-            Pod::UI.puts("Setting CLANG_CXX_LANGUAGE_STANDARD to #{ Helpers::Constants::cxx_language_standard } on #{ project.path }")
+            Pod::UI.puts("Setting #{cxxBuildsettingsName} to #{ Helpers::Constants::cxx_language_standard } on #{ project.path }")
 
             project.build_configurations.each do |config|
-                config.build_settings["CLANG_CXX_LANGUAGE_STANDARD"] = Helpers::Constants::cxx_language_standard
+                config.build_settings[cxxBuildsettingsName] = Helpers::Constants::cxx_language_standard
             end
 
             project.save()