Fix integration test in Owlv2 image processing tests (#42783)

Fix integration test

Author: yonigozlan

tests/models/owlv2/test_image_processing_owlv2.py

@@ -127,7 +127,7 @@ def test_image_processor_integration_test(self):
  pixel_values = processor(image, return_tensors="pt").pixel_values
 
  mean_value = round(pixel_values.mean().item(), 4)
- self.assertEqual(mean_value, 0.2353)
+ self.assertEqual(mean_value, -0.2303)
 
  @slow
  def test_image_processor_integration_test_resize(self):