fix: use timestamp_to_datetime for state restoration

Follow-Up: d1e0f72 835bb95 e4fb530

Author: SpEcHiDe

pyrogram/types/object.py

@@ -106,7 +106,7 @@ def __setstate__(self, state):
 
             # Maybe a better alternative would be https://docs.python.org/3/library/inspect.html#inspect.signature
             if isinstance(obj, tuple) and len(obj) == 2 and obj[0] == "dt":
-                state[attr] = datetime.fromtimestamp(obj[1])
+                state[attr] = pyrogram.utils.timestamp_to_datetime(obj[1])
 
         self.__dict__ = state