chore(deps-dev): update phpunit/phpunit requirement

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/12.4.2/ChangeLog-12.4.md)
- [Commits](sebastianbergmann/phpunit@12.3.15...12.4.2)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 12.4.2
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -16,7 +16,7 @@
     },
     "require-dev": {
         "phpstan/phpstan": "2.1.29",
-        "phpunit/phpunit": "12.3.15",
+        "phpunit/phpunit": "12.4.2",
         "friendsofphp/php-cs-fixer": "3.88.2"
     },
     "autoload": {