fix: revert default date-time behaviour

Author: mueslo

src/datamodel_code_generator/model/pydantic_v2/types.py

@@ -30,7 +30,7 @@ def type_map_factory(
                 data_type,
                 strict_types,
                 pattern_key,
-                target_datetime_class or DatetimeClassType.Datetime,
+                target_datetime_class or DatetimeClassType.Awaredatetime,
             ),
             Types.hostname: self.data_type.from_import(
                 IMPORT_CONSTR,