`link-external-newwindow: true` not respected by default listing

Listings type grid/table do respect link-external-newwindow but not the default type.

1. quarto create project blog demo Demo
2. Replace content of index.qmd

---
title: "Demo"
link-external-newwindow: true
listing:
  contents:
    - path: https://www.nature.com/articles/d41586-024-00692-7
      title: "China–US climate collaboration concerns as Xie and Kerry step down"
      author: Smriti Mallapaty
      description: "Gang's quote on the importance to continue the research exchange and colloboration 'If the river freezes over, water will still flow underneath.'"
      date: "2024-03-12"
      categories: [Nature]
  sort: "date desc"
  type: default
  categories: true
  sort-ui: false
  filter-ui: false
page-layout: full
title-block-banner: true
---