[TASK] Update typo3/testing-framework to v8

| datasource | package                 | from  | to    |
| ---------- | ----------------------- | ----- | ----- |
| packagist  | typo3/testing-framework | 7.1.0 | 8.2.1 |

composer.json

@@ -43,7 +43,7 @@
 		"ssch/typo3-rector": "^1.0 || ^2.0",
 		"symfony/event-dispatcher": "^4.4 || ^5.0",
 		"typo3/coding-standards": "^0.6.0 || ^0.7.0",
-		"typo3/testing-framework": "^6.15 || ^7.0.2"
+		"typo3/testing-framework": "^6.15 || ^7.0.2 || ^8.0.0"
 	},
 	"autoload": {
 		"psr-4": {