[BUGFIX] Migrate another unit test file to phpunit 9

We missed this one with #94706, which leads to warnings
from phpunit when executing unit test suite.

Resolves: #94723
Related: #94706
Releases: master
Change-Id: I73d72d0def421f097b313c86ea7cad206804c372
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70235


Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Benni Mack <benni@typo3.org>