Update dependency phpunit/phpunit to v12

Author: renovate[bot]

Diff for: composer.json

@@ -14,7 +14,7 @@
 		"php-parallel-lint/php-parallel-lint": "^1.4",
 		"phpstan/phpstan-phpunit": "^2.0",
 		"phpstan/phpstan-strict-rules": "^2.0",
-		"phpunit/phpunit": "^9.6"
+		"phpunit/phpunit": "^12.0"
 	},
 	"config": {
 		"platform": {