Update dependency phpunit/phpunit to v12

| datasource | package         | from   | to     |
| ---------- | --------------- | ------ | ------ |
| packagist  | phpunit/phpunit | 11.5.6 | 12.0.1 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

composer.json

@@ -37,7 +37,7 @@
         "laminas/laminas-coding-standard": "^3.0",
         "laminas/laminas-diactoros": "^3.2",
         "laminas/laminas-servicemanager": "^4.0",
-        "phpunit/phpunit": "^11.5",
+        "phpunit/phpunit": "^12.0",
         "psalm/plugin-phpunit": "^0.19.2",
         "roave/security-advisories": "dev-master",
         "squizlabs/php_codesniffer": "^3.7",