[TASK] Raise typo3/testing-framework:^6.8.4

Acceptance tests now properly configure graphics
magick, so image generation works for them. This
triggeres different and more relevant code paths.

composer req --dev typo3/testing-framework:^6.8.4
composer req --dev typo3/testing-framework:^6.8.4 -d typo3/sysext/core --no-update

Change-Id: I65dd2061c13479fb031373973860d3204dfe4bbf
Resolves: #94339
Releases: master, 10.4
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69484
Tested-by: core-ci <typo3@b13.com>
Tested-by: Jochen <rothjochen@gmail.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Jochen <rothjochen@gmail.com>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

composer.json

@@ -97,7 +97,7 @@
 		"phpstan/phpstan": "^0.12.64",
 		"phpunit/phpunit": "^8.5.13",
 		"typo3/cms-styleguide": "~11.3.0",
-		"typo3/testing-framework": "^6.8.3"
+		"typo3/testing-framework": "^6.8.4"
 	},
 	"suggest": {
 		"ext-gd": "GDlib/Freetype is required for building images with text (GIFBUILDER) and can also be used to scale images",

typo3/sysext/core/composer.json

@@ -77,7 +77,7 @@
 		"phpspec/prophecy": "^1.12.2",
 		"phpstan/phpstan": "^0.12.64",
 		"typo3/cms-styleguide": "~11.3.0",
-		"typo3/testing-framework": "^6.8.3"
+		"typo3/testing-framework": "^6.8.4"
 	},
 	"suggest": {
 		"ext-fileinfo": "Used for proper file type detection in the file abstraction layer",