Fix langchain imports for langchain 1.x compatibility

ChatPromptTemplate moved from langchain.prompts to langchain_core.prompts
in langchain 1.x.

examples/foundational/07b-interruptible-langchain.py

@@ -8,9 +8,9 @@
 import os
 
 from dotenv import load_dotenv
-from langchain.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain_community.chat_message_histories import ChatMessageHistory
 from langchain_core.chat_history import BaseChatMessageHistory
+from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain_core.runnables.history import RunnableWithMessageHistory
 from langchain_openai import ChatOpenAI
 from loguru import logger

tests/test_langchain.py

@@ -6,8 +6,8 @@
 
 import unittest
 
-from langchain.prompts import ChatPromptTemplate
 from langchain_core.language_models import FakeStreamingListLLM
+from langchain_core.prompts import ChatPromptTemplate
 
 from pipecat.frames.frames import (
     InterruptionFrame,