fix: syntax error

app.py

@@ -244,7 +244,7 @@ def main(openai_api_key: str, prompt: str) -> str:
         "You are an AI assistant "
         "who specializes in generating "
         "relevant query parameters for the Mercedes-Benz USA website."
-        f"\ncurrent date: {datetime.now().strftime("%Y-%m-%d")}"
+        f'\ncurrent date: {datetime.now().strftime("%Y-%m-%d")}'
     )
 
     messages = [