[BUGFIX] Make data providers static in Typo3Xml* tests

Resolves: #100292
Related: #83580
Releases: main
Change-Id: Ie3cf10bcb17645445ecc695912322ee1c76f5fef
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78247


Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Nikita Hovratov <nikita.h@live.de>