[BUGFIX] Fix warning on array key "data"

Patch fixes warning on PHP 8.1 in MenuProcessor

Resolves: #98150
Releases: main, 11.5
Change-Id: I9cee1d6d0adcde22a74e040ac53657db3348c514
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75496


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>