Remove unneded character (#43075)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/43075

There is a `\` in the new_architecture.rb file that should not be there.

## Changelog:
[Internal] - remove unnecessary character

Reviewed By: cortinico

Differential Revision: D53886548

fbshipit-source-id: a614368bed9f467b80c3384e4adc4be2cbcaba2d

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

@@ -7,7 +7,7 @@ require 'json'
 
 require_relative "./utils.rb"
 require_relative "./helpers.rb"
-\
+
 class NewArchitectureHelper
     @@cplusplus_version = "c++20"