[TASK] Update to PHPStan 1.8.11

Also update the PHPUnit PHPStan configuration.

This update gets rid of some false positives.

Run commands:

> composer req --dev phpstan/phpstan:^1.8.11
> composer req --dev phpstan/phpstan-phpunit:^1.1.3
> ./Build/Scripts/runTests.sh -s phpstanGenerateBaseline

Resolves: #98913
Releases: main, 11.5
Change-Id: Ifc374d02a2ad343bd6be9a61b2075deb019b98f7
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76257


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>