📝 fixes linting.

Author: nazrulworld

fhir_core/fhirabstractmodel.py

@@ -312,7 +312,9 @@ def _fhir_iter(
                 ext_key = f"{field_key}__ext"
                 ext_val = self.__dict__.get(ext_key, None)
                 if ext_val is not None:
-                    ext_val = self._serialize_non_primitive_value(ext_val, serialize, info)
+                    ext_val = self._serialize_non_primitive_value(
+                        ext_val, serialize, info
+                    )
                 if ext_val is not None:
                     dict_key_ = (
                         info.by_alias and self.model_fields[ext_key].alias or ext_key