Update dependency phpunit/phpunit to v12

Author: renovate[bot]

composer.json

@@ -10,7 +10,7 @@
         "magewirephp/magewire": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6 || ^7 || ^8 || ^9 || ^10 || ^11",
+        "phpunit/phpunit": "^6 || ^7 || ^8 || ^9 || ^10 || ^11 || ^12",
         "magento/magento-coding-standard": "*",
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
         "phpstan/phpstan": "^0.12.2 || ^1.2 || ^2.0",