Update dependency phpunit/phpunit to v12

| datasource | package         | from    | to      |
| ---------- | --------------- | ------- | ------- |
| packagist  | phpunit/phpunit | 11.5.36 | 12.3.15 |


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

Author: renovate[bot]

composer.json

@@ -23,7 +23,7 @@
   },
   "require-dev": {
     "laminas/laminas-coding-standard": "^3.1",
-    "phpunit/phpunit": "^11.5",
+    "phpunit/phpunit": "^12.0",
     "psalm/plugin-phpunit": "^0.19.5",
     "vimeo/psalm": "^6.10"
   },