[BUGFIX] Revert typo3/testing-framework providing prophecy trait

The typo3/testing-framework 6.4.4 included a backport of the prophecy
trait that is required for phpunit v10 and causes lots of deprecation
messages in phpunit v9.
This backport causes problems with phpunit v8, though. So the inclusion
is reverted.

Used command:
	composer require --dev typo3/testing-framework:^6.4.5

Resolves: #92495
Related: #92477
Releases: master, 10.4
Change-Id: Iecaa42ee1fbbab4fceacefb96979da240c7d7872
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66061


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>