Fix typo in process_status_update_service.rb allowing more than 4 media attachments (#39978)

app/services/activitypub/process_status_update_service.rb

@@ -92,7 +92,7 @@ class ActivityPub::ProcessStatusUpdateService < BaseService
     as_array(@json['attachment']).each do |attachment|
       media_attachment_parser = ActivityPub::Parser::MediaAttachmentParser.new(attachment)
 
-      next if media_attachment_parser.remote_url.blank? || @next_media_attachments.size > Status::MEDIA_ATTACHMENTS_LIMIT
+      next if media_attachment_parser.remote_url.blank? || @next_media_attachments.size >= Status::MEDIA_ATTACHMENTS_LIMIT
 
       begin
         media_attachment   = previous_media_attachments.find { |previous_media_attachment| previous_media_attachment.remote_url == media_attachment_parser.remote_url }