[TASK] Update to PHPStan 1.9.0

This update finds new problems and gets rid of
some false positives.

Run commands:

> composer req --dev phpstan/phpstan:^1.9.0
> ./Build/Scripts/runTests.sh -s phpstanGenerateBaseline

Blog article about the new release:
https://phpstan.org/blog/phpstan-1-9-0-with-phpdoc-asserts-list-type

Resolves: #98986
Releases: main, 11.5
Change-Id: I15516853c3a1bac80b80466fe4bae8a0f150ba68
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76397


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