[BUGFIX] Follow-Up: Fatal error due to missing use statement

A fatal error occurs in the DataHandler.php due to a missing
use statement that was forgotten in the backport.

Related: #52636
Releases: 6.1
Change-Id: I6f893e56f86f3ade6e685efb7c40b73fa28c1840
Reviewed-on: https://review.typo3.org/24828
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters