[TASK] Update changelog and version to 6.1.0

Releases: 6.1
Resolves: #47514
Change-Id: Idab269e29551acf52edc521559da6ab0bc10c4b2
Reviewed-on: https://review.typo3.org/20117
Reviewed-by: Anja Leichsenring
Tested-by: Anja Leichsenring
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Alexander Schnitzler
Tested-by: Alexander Schnitzler