Update dependency phpunit/phpunit to v12 [SECURITY]

| datasource | package         | from    | to      |
| ---------- | --------------- | ------- | ------- |
| packagist  | phpunit/phpunit | 11.5.55 | 12.5.22 |


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

Author: renovate[bot]

composer.json

@@ -57,7 +57,7 @@
     "phpbench/phpbench": "^1.4.1",
     "phpstan/phpstan": "^2.1.11",
     "phpstan/phpstan-phpunit": "^2.0",
-    "phpunit/phpunit": "^11.5.15",
+    "phpunit/phpunit": "^12.0.0",
     "symfony/messenger": "^5.4.31 || ^6.4.0 || ^7.0.1 || ^8.0.0",
     "symfony/var-dumper": "^5.4.29 || ^6.4.0 || ^7.0.0 || ^8.0.0",
     "wnx/commonmark-markdown-renderer": "^1.5.0"