[BUGFIX] Fix phpstan errors from ReturnTypeRule

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Resolves: #94265
Releases: master
Change-Id: I4e5e94f3e9f041e4ee8bab93a7ced73077250ee9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69371


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>