fix(security): use RestrictedUnpickler in load_instance (#2153)

* fix(security): enforce RestrictedUnpickler for load_instance to prevent unsafe pickle deserialization

* fix: lint error

examples/orderbook_data/create_dataset.py

@@ -6,6 +6,7 @@ NOTE:
 - !!!!!!!!!!!!!!!TODO!!!!!!!!!!!!!!!!!!!:
     - Its structure is not well designed and very ugly, your contribution is welcome to make importing dataset easier
 """
+
 from datetime import date, datetime as dt
 import os
 from pathlib import Path