fix: make hashed idempotency key stable across status transitions

This protects against functions that inadvertently change the incoming event data

Author: ojongerius

aws_lambda_powertools/utilities/idempotency/base.py

@@ -1,5 +1,6 @@
 import logging
 from typing import Any, Callable, Dict, Optional, Tuple
+from copy import deepcopy
 
 from aws_lambda_powertools.utilities.idempotency.config import IdempotencyConfig
 from aws_lambda_powertools.utilities.idempotency.exceptions import (
@@ -69,7 +70,7 @@ def __init__(
             Function keyword arguments
         """
         self.function = function
-        self.data = _prepare_data(function_payload)
+        self.data = deepcopy(_prepare_data(function_payload))
         self.fn_args = function_args
         self.fn_kwargs = function_kwargs