[BUGFIX] Missing \TYPO3\CMS\Core\Utility\ in ResourceFactory

After merge of the new signal inside the ResourceFactory
the call to GeneralUtility is wrong.

Resolves: #51012
Releases: 6.1, 6.0
Change-Id: Ia76d26559a8cc3618bd4fcd11c750b3f1cd885c7
Reviewed-on: https://review.typo3.org/23042
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters