docs: add changelog entry for #14281 backport

Author: cderv

news/changelog-1.9.md

@@ -3,6 +3,7 @@
 ## In this release
 
 - ([#14267](https://github.com/quarto-dev/quarto-cli/issues/14267)): Fix Windows paths with accented characters (e.g., `C:\Users\Sébastien\`) breaking dart-sass compilation.
+- ([#14281](https://github.com/quarto-dev/quarto-cli/issues/14281)): Fix transient `.quarto_ipynb` files accumulating during `quarto preview` with Jupyter engine.
 
 ## In previous releases