[TASK] Activate a unit test with PHP 8.1

There was a skipped unit test due to a PHP 8.1 bug.
Latest rc6 fixed the issue, the test can be activated
again.

Resolves: #95976
Related: #95501
Releases: master
Change-Id: Ib5cebf9edd544ca1aa3b91474c6032bf5721176e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72174


Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>