Move require to where it's needed

actionpack/lib/action_controller/vendor/html-scanner/html/sanitizer.rb

 require 'set'
 require 'cgi'
 require 'active_support/core_ext/class/attribute'
+require 'active_support/core_ext/class/attribute_accessors'
 
 module HTML
   class Sanitizer

actionpack/lib/action_dispatch/middleware/exception_wrapper.rb

 require 'action_controller/metal/exceptions'
 require 'active_support/core_ext/exception'
+require 'active_support/core_ext/class/attribute_accessors'
 
 module ActionDispatch
   class ExceptionWrapper
@@ -76,4 +77,4 @@ def backtrace_cleaner
       @backtrace_cleaner ||= @env['action_dispatch.backtrace_cleaner']
     end
   end
-end
\ No newline at end of file
+end

actionpack/lib/action_view.rb

@@ -21,8 +21,6 @@
 # WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #++
 
-require 'active_support/core_ext/class/attribute_accessors'
-
 require 'active_support'
 require 'action_pack'
 

actionpack/lib/action_view/base.rb

 require 'active_support/core_ext/module/attr_internal'
 require 'active_support/core_ext/module/delegation'
 require 'active_support/core_ext/class/attribute'
+require 'active_support/core_ext/class/attribute_accessors'
 require 'active_support/ordered_options'
 require 'action_view/log_subscriber'
 

actionpack/lib/action_view/helpers/form_helper.rb

@@ -5,6 +5,7 @@
 require 'action_view/helpers/active_model_helper'
 require 'action_view/helpers/tags'
 require 'active_support/core_ext/class/attribute'
+require 'active_support/core_ext/class/attribute_accessors'
 require 'active_support/core_ext/hash/slice'
 require 'active_support/core_ext/object/blank'
 require 'active_support/core_ext/string/output_safety'

actionpack/lib/action_view/template/resolver.rb

 require "pathname"
 require "active_support/core_ext/class"
+require "active_support/core_ext/class/attribute_accessors"
 require "action_view/template"
 
 module ActionView