[TASK] Update typo3/testing-framework

Update the typo3/testing-framework to pull in a
needed correction as preparation for functional
tests with PHP 8.3.

Used command(s):

> composer require --dev \
    typo3/testing-framework:^6.16.9

Resolves: #101538
Releases: main, 12.4, 11.5
Change-Id: Id26531be8c49a9b1ee9624c178342659b28d3eab
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80302


Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>