Merge pull request #577 from tompng/autoload_generic_object

Autoload JSON::GenericObject to avoid require ostruct warning in Ruby 3.4

Author: hsbt

lib/json/common.rb

@@ -1,8 +1,9 @@
 #frozen_string_literal: false
 require 'json/version'
-require 'json/generic_object'
 
 module JSON
+  autoload :GenericObject, 'json/generic_object'
+
   NOT_SET = Object.new.freeze
   private_constant :NOT_SET