fix test

Author: lgarber-akamai

linode_api4/objects/linode.py

@@ -1,3 +1,4 @@
+import copy
 import string
 import sys
 from dataclasses import dataclass, field
@@ -1971,6 +1972,10 @@ def upgrade_interfaces(
             data=_flatten_request_body_recursive(drop_null_keys(params)),
         )
 
+        # This resolves an edge case where `result["interfaces"]` persists across
+        # multiple calls, which can cause parsing errors when expanding them below.
+        result = copy.deepcopy(result)
+
         self.invalidate()
 
         # We don't convert interface dicts to LinodeInterface objects on dry runs