Use stable url for MNIST (#749)

* use stable url

* remove deprecated flag

llms/mlx_lm/utils.py

@@ -80,7 +80,6 @@ def get_model_path(path_or_hf_repo: str, revision: Optional[str] = None) -> Path
                     "*.tiktoken",
                     "*.txt",
                 ],
-                resume_download=True,
             )
         )
     return model_path

mnist/mnist.py

@@ -9,7 +9,9 @@ import numpy as np
 
 
 def mnist(
-    save_dir="/tmp", base_url="http://yann.lecun.com/exdb/mnist/", filename="mnist.pkl"
+    save_dir="/tmp",
+    base_url="https://raw.githubusercontent.com/fgnt/mnist/master/",
+    filename="mnist.pkl",
 ):
     """
     Load the MNIST dataset in 4 tensors: train images, train labels,