fix: restrict method to GET request

Author: nikkothari22

raven/api/ai_features.py

@@ -4,7 +4,7 @@
 from raven.ai.handler import get_variables_for_instructions
 
 
-@frappe.whitelist()
+@frappe.whitelist(methods=["GET"])
 def get_instruction_preview(instruction: str):
 	"""
 	Function to get the rendered instructions for the bot