Update prompts.yaml

prompts.yaml

@@ -1,4 +1,8 @@
-final_answer: "Thought: I now know the final answer\nFinal Answer: {final_answer}"
+final_answer:
+  pre_messages: |-
+    Thought: I now know the final answer.
+  post_messages: |-
+    Final Answer: {{final_answer}}
 
 "system_prompt": |-
   You are an expert assistant who can solve any task using code blobs. You will be given a task to solve as best you can.