Fix typing issue

Change-Id: Id42da55562005f248733b0d5db58f2b18b0c2932

Author: Erik-Lundell

backends/arm/test/runner_utils.py

@@ -16,9 +16,9 @@
 
 import numpy as np
 import torch
+import tosa_reference_model
 
 from executorch.backends.arm.test.common import arm_test_options, is_option_enabled
-import tosa_reference_model
 
 from torch.export import ExportedProgram
 from torch.fx.node import Node