[DOCS] Fix code highlighting in changelog

Releases: main, 12.4
Resolves: #105198
Change-Id: I512147b5e17d20c31498caee634eb6d29c816c16
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/86420


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Chris Müller <typo3@brotkrueml.dev>
Reviewed-by: Chris Müller <typo3@brotkrueml.dev>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: core-ci <typo3@b13.com>