fix(OpenAI): adjust tests for 'keepalive' on responses

Author: iBotPeaches

tests/Fixtures/Streams/ResponseCompletionCreate.txt

@@ -9,3 +9,4 @@ data: {"type":"response.output_text.done","item_id":"msg_67ccf190ca3881909d433c5
 data: {"type":"response.content_part.done","item_id":"msg_67ccf190ca3881909d433c50b1f6357e087bb177ab789d5c","output_index":1,"content_index":0,"part":{"type":"output_text","text":"As of today, March 9, 2025, one notable positive news story...","annotations":[{"type":"url_citation","start_index":442,"end_index":557,"url":"https://.../?utm_source=chatgpt.com","title":"..."},{"type":"url_citation","start_index":962,"end_index":1077,"url":"https://.../?utm_source=chatgpt.com","title":"..."},{"type":"url_citation","start_index":1336,"end_index":1451,"url":"https://.../?utm_source=chatgpt.com","title":"..."}]}, "sequence_number": 9}
 data: {"type":"response.output_item.done","output_index":1,"item":{"id":"msg_67ccf190ca3881909d433c50b1f6357e087bb177ab789d5c","type":"message","status":"completed","role":"assistant","content":[{"type":"output_text","text":"As of today, March 9, 2025, one notable positive news story...","annotations":[{"type":"url_citation","start_index":442,"end_index":557,"url":"https://.../?utm_source=chatgpt.com","title":"..."},{"type":"url_citation","start_index":962,"end_index":1077,"url":"https://.../?utm_source=chatgpt.com","title":"..."},{"type":"url_citation","start_index":1336,"end_index":1451,"url":"https://.../?utm_source=chatgpt.com","title":"..."}]}]}, "sequence_number": 10}
 data: {"type":"response.completed","response":{"id":"resp_67ccf18ef5fc8190b16dbee19bc54e5f087bb177ab789d5c","object":"response","created_at":1741484430,"status":"completed","error":null,"incomplete_details":null,"instructions":null,"max_output_tokens":null,"model":"gpt-4o-2024-08-06","output":[{"type":"web_search_call","id":"ws_67ccf18f64008190a39b619f4c8455ef087bb177ab789d5c","status":"completed","action":{"type":"search","query":"what was a positive news story from today?","sources":[{"type":"url","url":"https://example.com/news/positive-story"},{"type":"url","url":"https://another.example.com/related-article"}]}},{"type":"message","id":"msg_67ccf190ca3881909d433c50b1f6357e087bb177ab789d5c","status":"completed","role":"assistant","content":[{"type":"output_text","text":"As of today, March 9, 2025, one notable positive news story...","annotations":[{"type":"url_citation","start_index":442,"end_index":557,"url":"https://.../?utm_source=chatgpt.com","title":"..."},{"type":"url_citation","start_index":962,"end_index":1077,"url":"https://.../?utm_source=chatgpt.com","title":"..."},{"type":"url_citation","start_index":1336,"end_index":1451,"url":"https://.../?utm_source=chatgpt.com","title":"..."}]}]}],"parallel_tool_calls":true,"previous_response_id":null,"reasoning":{"effort":null,"generate_summary":null},"store":true,"temperature":1.0,"text":{"format":{"type":"text"}},"tool_choice":"auto","tools":[{"type":"web_search_preview","domains":[],"search_context_size":"medium","user_location":{"type":"approximate","city":null,"country":"US","region":null,"timezone":null}}],"top_p":1.0,"truncation":"disabled","usage":{"input_tokens":328,"input_tokens_details":{"cached_tokens":0},"output_tokens":356,"output_tokens_details":{"reasoning_tokens":0},"total_tokens":684},"user":null,"metadata":{}}, "sequence_number": 11}
+data: {"type":"keepalive", "sequence_number": 12}