chore: allow current test tooling so the suite can run again (#57)

The dev requirements pinned Pest 2 and PHPUnit 10, which cannot be
installed on PHP 8.4 or 8.5: paratest needs PHPUnit 12 there, and the
constraint forbids it. `composer update` failed outright, so the suite
could not be run at all on a current PHP.

Widening the three test packages to accept their current majors fixes it.
No source or test changes were needed.

Verified on PHP 8.5 with Pest 4 and PHPUnit 12: 116 tests pass, PHPStan
reports no errors, Pint is clean.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: lam0819

composer.json

@@ -21,10 +21,10 @@
     },
     "require-dev": {
         "laravel/pint": "^1.22",
-        "pestphp/pest": "^2.0",
-        "pestphp/pest-plugin-arch": "^2.7",
+        "pestphp/pest": "^2.0|^3.0|^4.0",
+        "pestphp/pest-plugin-arch": "^2.7|^3.0|^4.0",
         "phpstan/phpstan": "^2.0",
-        "phpunit/phpunit": "^10.0"
+        "phpunit/phpunit": "^10.0|^11.0|^12.0"
     },
     "autoload": {
         "psr-4": {