[BUGFIX] Fix type warnings in the workspaces ActionHandler

Resolves: #97425
Releases: main, 11.5
Change-Id: Ie3679f8a0f51ee2000ce45dfab1ea82bdc67c0ff
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74618


Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>