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>

Author: renovate[bot]

composer.json

@@ -27,7 +27,7 @@
     },
     "require-dev": {
         "laminas/laminas-coding-standard": "^3.0",
-        "phpunit/phpunit": "^11.5",
+        "phpunit/phpunit": "^12.0",
         "psalm/plugin-phpunit": "^0.19.2",
         "vimeo/psalm": "^6.0"
     },