Update opis/json-schema version constraint

resolve the version conflict with mcp/sdk.

Author: tacman

composer.json

@@ -40,7 +40,7 @@
         "nyholm/psr7": "^1.2",
         "friendsofphp/php-cs-fixer": "^3.2.2",
         "symfony/phpunit-bridge": "^6.0 || ^7.0 || ^8.0",
-        "opis/json-schema": "^1.0",
+        "opis/json-schema": "^1.0 || ^2.0",
         "symfony/console": "^6.0 || ^7.0 || ^8.0",
         "symfony/process": "^6.0 || ^7.0 || ^8.0"
     },