chore: revert addition of changelog entry

Author: mcanouil

news/changelog-1.5.md

@@ -42,7 +42,6 @@ All changes included in 1.5:
 - ([#8851](https://github.com/quarto-dev/quarto-cli/issues/8851)): Don't strip `index.html` from external paths.
 - ([#8977](https://github.com/quarto-dev/quarto-cli/issues/8977)): Don't decorate about links within external link icons.
 - ([#9356](https://github.com/quarto-dev/quarto-cli/issues/9356)): Don't process column classes for figures inside the About divs.
-- ([#9468](https://github.com/quarto-dev/quarto-cli/issues/9468)): Respect `link-external-newwindow: true` in "default" type listing.
 
 ## Book