Fixes pre-commit

The xgboost snippets weren't correct.

Author: skrawcz

docs/concepts/_snippets/data_loader.py

@@ -1,4 +1,8 @@
 import dataclasses
+from os import PathLike
+from typing import Any, Collection, Dict, Tuple, Type, Union
+
+import xgboost
 
 from hamilton.io import utils
 from hamilton.io.data_adapters import DataLoader
@@ -14,6 +18,7 @@ def applicable_types(cls) -> Collection[Type]:
 
     def load_data(self, type_: Type) -> Tuple[xgboost.XGBModel, Dict[str, Any]]:
         # uses the XGBoost library
+        model = type_()
         model.load_model(self.path)
         metadata = utils.get_file_metadata(self.path)
         return model, metadata

docs/concepts/_snippets/data_saver.py

@@ -1,4 +1,8 @@
 import dataclasses
+from os import PathLike
+from typing import Any, Collection, Dict, Type, Union
+
+import xgboost
 
 from hamilton.io import utils
 from hamilton.io.data_adapters import DataSaver