Raise typo3/testing-framework requirement for v13 compatibility

Some 8.x versions are not compatible with v13 due to changes in the
entrypoints, so we now require the highest currently available version.

Author: andreaswolf

composer.json

@@ -37,7 +37,7 @@
 		"symfony/console": "^6.2 || ^7.0",
 		"symfony/filesystem": "^6.2 || ^7.0",
 		"typo3/coding-standards": "^0.5.4",
-		"typo3/testing-framework": "^8.0 || ^9.0"
+		"typo3/testing-framework": "^8.2.3 || ^9.0"
 	},
 	"autoload": {
 		"psr-4": {