feat(tests): Añadido soporte de autenticación con access token en tests GET de todos los módulos de reference_data. Ahora los tests usan un fixture access_token y envían el header Authorization. Módulos actualizados: containers, countries, currency_types, material_types, states, valuation_methods, incoterms, payment_methods, sectors, customs_sections, customs_warehouses, invoice_types, pedimento_codes, pedimento_regimens, code_pedimento_regimens, transport_modes, transport_types.

backend/api/v1/modules/public/reference_data/countries/dto.py

@@ -1,4 +1,5 @@
 from pydantic import BaseModel, Field
+from pydantic import ConfigDict
 
 class CountryDTO(BaseModel):
     m3_key: str = Field(..., min_length=1, max_length=3)
@@ -7,6 +8,5 @@ class CountryDTO(BaseModel):
     description_es: str
     description_en: str
 
-    class Config:
-        from_attributes = True
+    model_config = ConfigDict(from_attributes=True)