fix: refactor attributes building

Signed-off-by: Danju Visvanathan <danju.visvanathan@gmail.com>

Author: danjuv

openfeature_flagsmith/provider.py

@@ -134,15 +134,10 @@ def _resolve(
 
     def _get_flags(self, evaluation_context: EvaluationContext = EvaluationContext()):
         if targeting_key := evaluation_context.targeting_key:
-            traits = {}
-            for key, value in evaluation_context.attributes.items():
-                if key == "traits":
-                    continue
-                else:
-                    traits[key] = value
-            traits.update(evaluation_context.attributes.get("traits", {}))
+            nested_traits = evaluation_context.attributes.pop("traits", {})
+            flattened_traits = {**evaluation_context.attributes, **nested_traits}
             return self._client.get_identity_flags(
                 identifier=targeting_key,
-                traits=traits,
+                traits=flattened_traits,
             )
         return self._client.get_environment_flags()