[TASK] Update to PHPStan 1.4.9

This update gets rid of a false positive:

https://github.com/phpstan/phpstan-phpunit/issues/120

Resolves: #97163
Releases: main, 11.5
Change-Id: I6f7ecd909a127b5940b928d81c94ab7b3404cd49
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/73896


Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>