[TASK] Upgrade to `phpunit/phpunit ^11.2.1`

The nightly CI run recently revealed a regression
within phpunit [1] which has been fixed meanwhile
upstream [2] by Sebastian Bergmann.

This change raises phpunit to the bugfix version
and the conflict is removed.

Used command(s):

  composer require --dev "phpunit/phpunit":"^11.2.1"

[1] https://github.com/sebastianbergmann/phpunit/issues/5857
[2] https://github.com/sebastianbergmann/phpunit/releases/tag/11.2.1

Resolves: #104036
Releases: main
Change-Id: I8f83ca4b574d174dc0f13bb4a59ad5f35a905204
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/84595


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>