[BUGFIX] Release version 1.6.1

Resolves: #59668
Releases: 1.6
Change-Id: I8a7cefbb0117a04bc8f0c1af3ac3f96a38a42eb2
Reviewed-on: https://review.typo3.org/30881
Reviewed-by: Francois Suter
Tested-by: Francois Suter