composer require --dev typo3/testing-framework:~6.1.0

Also reverts changes to tests for phpunit 8.3 only.

Resolves: #89833
Releases: master
Change-Id: I834f70452775ea18960da162bb2affe459b8556a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/62519


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>