Fixes #21115: Include attribute_data in ModuleType YAML export

- Added airflow and attribute_data fields to ModuleType.to_yaml() method
- Ensures custom JSON properties from module type profiles are properly exported
- Maintains consistency with import functionality in ModuleTypeImportForm

netbox/dcim/models/modules.py

@@ -155,6 +155,8 @@ class ModuleType(ImageAttachmentsMixin, PrimaryModel, WeightMixin):
             'description': self.description,
             'weight': float(self.weight) if self.weight is not None else None,
             'weight_unit': self.weight_unit,
+            'airflow': self.airflow,
+            'attribute_data': self.attribute_data,
             'comments': self.comments,
         }