[TASK] Use $this for expectException* methods of PHPunit

The methods are now called statically but are not statically defined.
Use $this instead.

Resolves: #94894
Releases: master
Change-Id: I2b1d5efc21af49ce447368440cbcbe5fabc94ffe
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70601


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>