Merge pull request #35508 from cjlarose/add-explicit-require-in-actiontext-initializer

Explicitly require rails-html-sanitizer gem in ActionText helpers

actiontext/app/helpers/action_text/content_helper.rb

 # frozen_string_literal: true
 
+require "rails-html-sanitizer"
+
 module ActionText
   module ContentHelper
     SANITIZER          = Rails::Html::Sanitizer.white_list_sanitizer