[client] Handle region to region relationship

Author: Samuel Hassine

pycti/api/opencti_api_client.py

@@ -3808,6 +3808,9 @@ def resolve_role(self, relation_type, from_type, to_type):
                     'country': {'from_role': 'localized', 'to_role': 'location'},
                     'city': {'from_role': 'localized', 'to_role': 'location'}
                 },
+                'region': {
+                    'region': {'from_role': 'localized', 'to_role': 'location'}
+                },
                 'country': {
                     'region': {'from_role': 'localized', 'to_role': 'location'}
                 },