[TASK] Raise typo3/testing-framework to ^6.8.2

Brings a bugfix to be more strict comparing
CSV fixtures with DB rows.

composer req --dev typo3/testing-framework:^6.8.2

Resolves: #94066
Releases: master, 10.4
Change-Id: Ie21e85cdb29af0da02d6c8081a3fc842289cc09c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69024


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>