[TASK] Avoid type error in FileCollector

Resolves: #104557
Releases: main, 12.4, 11.5
Change-Id: I1bea6d74fc444007c8787e0a642c86b35a7ccb90
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85534


Tested-by: Wolfgang Wagner <wwagner@wwagner.net>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>