[TASK] Release version 1.7.1

Resolves: #61237
Releases: 1.7
Change-Id: Ie729f268760b6bd36407db5fd00eb2af52ea74f7
Reviewed-on: http://review.typo3.org/32481
Reviewed-by: Francois Suter <francois@typo3.org>
Tested-by: Francois Suter <francois@typo3.org>