Fix notebooks

- use dataset for audio example to fix permission issue with URL
- change pytorch_model.bin to model.safetensors
- speed up quantization notebook test by using only 10 samples
- update half() messaging (no longer needed to do half() on GPU)

Author: helena-intel

.github/workflows/test_openvino_notebooks.yml

@@ -49,5 +49,7 @@ jobs:
 
     - name: Test with Pytest
       run: |
+        sed -i 's/NUM_TRAIN_ITEMS = 600/NUM_TRAIN_ITEMS = 10/' notebooks/openvino/question_answering_quantization.ipynb
+        sed -i 's/# %pip install/%pip install/' notebooks/openvino/optimum_openvino_inference.ipynb
         python -m pytest --nbval-lax notebooks/openvino/optimum_openvino_inference.ipynb  notebooks/openvino/question_answering_quantization.ipynb