Allow hamcrest-php ^3.0

Native typehints landed in hamcrest 3.0.0; object-asserter is compatible
(no matcher extension, tests + phpstan green). Replaces the dev constraint
^2.1|3.0.x@dev with ^2.1 || ^3.0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: pscheit

composer.json

@@ -4,7 +4,7 @@
     "type": "library",
     "require": {
         "php": ">=8.2",
-        "hamcrest/hamcrest-php": "^2.1|3.0.x@dev"
+        "hamcrest/hamcrest-php": "^2.1 || ^3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^12",