chore(deps): Bump openai-php/client to 0.15

Author: tymondesigns

composer.json

@@ -22,7 +22,7 @@
         "cortexphp/model-info": "^0.3",
         "illuminate/collections": "^11.23",
         "mozex/anthropic-php": "^1.1",
-        "openai-php/client": "^0.13",
+        "openai-php/client": "^0.15",
         "psr-discovery/cache-implementations": "^1.2",
         "psr-discovery/event-dispatcher-implementations": "^1.1",
         "react/async": "^4.3",