Update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -15,7 +15,7 @@
 		"phpstan/phpstan-deprecation-rules": "^2.0",
 		"phpstan/phpstan-phpunit": "^2.0",
 		"phpstan/phpstan-strict-rules": "^2.0",
-		"phpunit/phpunit": "^9.6",
+		"phpunit/phpunit": "^12.0",
 		"webmozart/assert": "^1.11.0"
 	},
 	"config": {