fix macos test runner

Author: russellwheatley

tests/macos/Podfile

@@ -41,12 +41,5 @@ end
 post_install do |installer|
   installer.pods_project.targets.each do |target|
     flutter_additional_macos_build_settings(target)
-    
-    # Enable Swift 6 access level on imports feature
-    target.build_configurations.each do |config|
-      config.build_settings['OTHER_SWIFT_FLAGS'] ||= []
-      config.build_settings['OTHER_SWIFT_FLAGS'] << '-enable-experimental-feature'
-      config.build_settings['OTHER_SWIFT_FLAGS'] << 'AccessLevelOnImport'
-    end
   end
 end