🔨 refactor whisper_live according to flake8

tests/test_vad.py

@@ -1,7 +1,6 @@
 import unittest
 import numpy as np
 import torch
-import scipy.io as sio
 from whisper_live.tensorrt_utils import load_audio
 from whisper_live.vad import VoiceActivityDetection
 
@@ -25,4 +24,4 @@ class TestVoiceActivityDetection(unittest.TestCase):
     def test_vad_speech_detection(self):
         audio_tensor = torch.from_numpy(load_audio("assets/jfk.flac"))
         speech_prob = self.vad(audio_tensor, self.sample_rate).item()
-        self.assertGreater(speech_prob, 0.5, "VAD failed to identify speech segment.")
+        self.assertGreater(speech_prob, 0.5, "VAD failed to identify speech segment.")