[TASK] Move changelog files into 10.4 folder

The changelog files for the version 10.4 must leave the
master folder now and move to their final home in 10.4.

Resolves: #91106
Releases: master
Change-Id: Ia2a97ef805653c2179426da9c228b052b6801472
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64226


Tested-by: Christian Eßl <indy.essl@gmail.com>
Tested-by: Richard Haeser <richard@maxserv.com>
Reviewed-by: Christian Eßl <indy.essl@gmail.com>
Reviewed-by: Richard Haeser <richard@maxserv.com>