Change file rename approach

litgpt/scripts/convert_hf_checkpoint.py

@@ -2,7 +2,6 @@
 
 import gc
 import json
-import os
 from collections import defaultdict
 from functools import partial
 from pathlib import Path
@@ -347,7 +346,7 @@ def convert_hf_checkpoint(
         with open(model_safetensor_map_json_path, encoding="utf-8") as json_map:
             bin_index = json.load(json_map)
         bin_files = {
-            checkpoint_dir / (os.path.splitext(bin)[0] + ".bin")
+            checkpoint_dir / Path(bin).with_suffix(".bin")
             for bin in bin_index["weight_map"].values()
         }
     else: