fix(responses): correct reasoning output type (#300)

Author: stainless-app[bot]

.stats.yml

@@ -1,2 +1,2 @@
 configured_endpoints: 78
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-9ce5257763fb30c6e0e1ee2bef7e13baf661511e09572207e528d643da8e16b3.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/openai-c8579861bc21d4d2155a5b9e8e7d54faee8083730673c4d32cbbe573d7fb4116.yml

openai-java-core/src/main/kotlin/com/openai/models/responses/Response.kt

@@ -736,7 +736,7 @@ private constructor(
          * A description of the chain of thought used by a reasoning model while generating a
          * response.
          */
-        fun addOutput(reasoning: ResponseOutputItem.Reasoning) =
+        fun addOutput(reasoning: ResponseReasoningItem) =
             addOutput(ResponseOutputItem.ofReasoning(reasoning))
 
         /** Whether to allow the model to run tool calls in parallel. */