[TASK] Raise typo3/testing-framework:^6.13.0

Brings a series of core v11 relevant PHP 8.1 E_ALL
preparations and a couple of minor details.

composer req --dev typo3/testing-framework:^6.13.0

Change-Id: I140866e8fb7014efbc33b7c1f25b2f840bd19ce2
Resolves: #95979
Releases: master, 10.4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/72176
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

composer.json

@@ -112,7 +112,7 @@
 		"phpstan/phpstan": "^0.12.99",
 		"phpunit/phpunit": "^9.5.10",
 		"typo3/cms-styleguide": "~11.5.0",
-		"typo3/testing-framework": "^6.12.0"
+		"typo3/testing-framework": "^6.13.0"
 	},
 	"suggest": {
 		"ext-gd": "GDlib/Freetype is required for building images with text (GIFBUILDER) and can also be used to scale images",