chore(examples): fix import bug in image2text demo

Co-Authored-By: Marco Vinciguerra <[email protected]>

Author: f-aguzzi

examples/single_node/image2text_node.py

@@ -5,7 +5,7 @@
 import os
 from dotenv import load_dotenv
 from scrapegraphai.nodes import ImageToTextNode
-from langchain_openai import ChatOpenAIImageToText
+from scrapegraphai.models import OpenAIImageToText
 
 load_dotenv()