[BUGFIX] Fix data type annotations in WidgetRegistry

Resolves: #92530
Releases: master, 10.4
Change-Id: If593ae69ec7862f45eeea7d0c15cebf98462139b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66096


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>