fix(openai): Use non-deprecated Pydantic method to extract response text (#4942)

Switch to Pydantic v2's `model_dump()` instead of `dict()` for serialization. The change avoids deprecation warnings during OpenAI response parsing that created issues in Sentry.

Author: JasonLovesDoggo

sentry_sdk/integrations/openai.py

@@ -237,7 +237,7 @@ def _set_output_data(span, response, kwargs, integration, finish_span=True):
 
     if hasattr(response, "choices"):
         if should_send_default_pii() and integration.include_prompts:
-            response_text = [choice.message.dict() for choice in response.choices]
+            response_text = [choice.message.model_dump() for choice in response.choices]
             if len(response_text) > 0:
                 set_data_normalized(span, SPANDATA.GEN_AI_RESPONSE_TEXT, response_text)