Remove an inline import (onnx#222)

Remove an inline import added by copilot

Signed-off-by: Justin Chu <justinchuby@users.noreply.github.com>

Author: justinchuby

src/onnx_ir/tensor_adapters_test.py

@@ -5,6 +5,7 @@
 from __future__ import annotations
 
 import importlib.util
+import io
 import tempfile
 import unittest
 
@@ -86,8 +87,6 @@ def test_tobytes(self, dtype: torch.dtype):
 
     def test_tofile_method_exists_and_works(self):
         """Test that tofile() method exists and works correctly."""
-        import io
-
         torch_tensor = torch.tensor([1.0, 2.0, 3.0], dtype=torch.float32)
         tensor = tensor_adapters.TorchTensor(torch_tensor)