Merge pull request rails#49139 from p8/actionmailer/require-previews

Remove internal usage of require_dependency

Author: rafaelfranca

actionmailer/lib/action_mailer/preview.rb

@@ -144,7 +144,7 @@ def preview_name
       private
         def load_previews
           preview_paths.each do |preview_path|
-            Dir["#{preview_path}/**/*_preview.rb"].sort.each { |file| require_dependency file }
+            Dir["#{preview_path}/**/*_preview.rb"].sort.each { |file| require file }
           end
         end