Add video play button fix to changelog

Author: bruvellu

news/changelog-1.9.md

@@ -8,3 +8,9 @@ All changes included in 1.9:
 
 - Update `esbuild` to 0.25.10
 - Update `deno` to 2.4.5
+
+## Formats
+
+### `html`
+
+- ([#13413](https://github.com/quarto-dev/quarto-cli/issues/13413)): Fix uncentered play button in videos from cross-reference divs.