fix: [vulnerability_lookup] Avoiding issues with Iterator in python3.8

misp_modules/modules/expansion/vulnerability_lookup.py

@@ -3,8 +3,8 @@
 from . import check_input_attribute, standard_error_message
 from ._vulnerability_parser.vulnerability_parser import (
     VulnerabilityMapping, VulnerabilityParser)
-from collections.abc import Iterator
 from pymisp import MISPObject
+from typing import Iterator
 
 misperrors = {'error': 'Error'}
 mispattributes = {'input': ['vulnerability'], 'format': 'misp_standard'}