[TASK] Update TYPO3 version to TYPO3 8.7-dev

Resolves: #79810
Releases: master
Change-Id: I8325ad82a66d7a2c4c5028ecf63fea690c5b7ac0
Reviewed-on: https://review.typo3.org/51674


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Jan Helke <typo3@helke.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>