[TASK] Migrate to short array syntax

As decided during T3ACME we will use the short
array syntax in master. The 7.6 branch will also be done
to make backporting easier.

Resolves: #77692
Releases: master,7.6
Change-Id: I37e9484b1012fc9161148257a842054c24d162ba
Reviewed-on: https://review.typo3.org/49651


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>