chore(deps): update dependency phpunit/phpunit to v12 (#97)

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

Author: renovate[bot]

composer.json

@@ -27,7 +27,7 @@
         "phpstan/phpstan": "^2.0.0",
         "phpstan/phpstan-phpunit": "^2.0.0",
         "phpstan/phpstan-strict-rules": "^2.0.0",
-        "phpunit/phpunit": "^11.0",
+        "phpunit/phpunit": "^12.0",
         "psr-mock/http": "^1.0"
     },
     "config": {