[TASK] Cleanup ChangeLog

Remove duplicate lines from ChangeLog

Change-Id: I62b32f9b0b37c3977bc61b2874e37cde289846df
Resolves: #49110
Releases: 6.2, 6.1, 6.0
Reviewed-on: https://review.typo3.org/21426
Reviewed-by: Stefan Neufeind
Tested-by: Stefan Neufeind
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters