[TASK] Raise PHP requirements to PHP 7.4

The PHP version that is required now, is PHP 7.4,
more specifically PHP 7.4.1, which fixed a
hard issue on the JIT compiler.

Used composer commands:
composer config platform.php 7.4.1
composer req php:^7.4
composer req php:^7.4 -d typo3/sysext/core --no-lock

Releases: master
Resolves: #92890
Change-Id: Iaf090b34b1f825adcdb5d42e8a4df20673677a6f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66717


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>