[TASK] News.txt Entry for Extbase Property Mapper explicit persisting

Resolves: #47411
Related: #47251
Related: #47182
Releases: 6.1
Change-Id: Ifa6195d6966595e418df159932113a4e09c63af8
Reviewed-on: https://review.typo3.org/20052
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring