deps: update openai-php/client v0.16 (#32)

Author: annuh

composer.json

@@ -17,7 +17,7 @@
     "require": {
         "php": "^8.2.0",
         "nyholm/psr7": "^1.8.2",
-        "openai-php/client": "^0.15.0",
+        "openai-php/client": "^0.16.0",
         "psr/http-client": "^1.0.3",
         "psr/http-factory": "^1.1.0",
         "symfony/config": "^5.4|^6.3|^7.1.1",