Remove user of sagemaker_containers (old deprecated package) in integration tests (use sagemaker_inference instead)

Author: davidthomas426

test/integration/local/test_serving.py

@@ -22,7 +22,7 @@
 from sagemaker.pytorch import PyTorchModel
 from sagemaker.predictor import BytesDeserializer, csv_deserializer, csv_serializer, \
     json_deserializer, json_serializer, npy_serializer, numpy_deserializer
-from sagemaker_containers.beta.framework import content_types
+from sagemaker_inference import content_types
 from torchvision import datasets, transforms
 
 from integration import training_dir, mnist_1d_script, model_cpu_tar, mnist_cpu_script, \