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/12.1.4/ChangeLog-12.1.md)
- [Commits](sebastianbergmann/phpunit@11.5.6...12.1.4)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 12.1.4
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -33,7 +33,7 @@
         "laravel/pint": "^1.0",
         "nunomaduro/collision": "^8.5",
         "phpstan/phpstan": "^2.1",
-        "phpunit/phpunit": "^11.5.6",
+        "phpunit/phpunit": "^12.1.4",
         "robiningelbrecht/phpunit-pretty-print": "^1.3",
         "spatie/ray": "^1.28",
         "symfony/http-client": "^7.2",