fix torch version for ipex tests

Author: echarlaix

.github/workflows/test_ipex.yml

@@ -30,6 +30,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
+        pip install torch==2.1.2 torchvision==0.16.2 torchaudio==2.1.2 --index-url https://download.pytorch.org/whl/cpu
         pip install .[ipex,tests]
     - name: Test with Pytest
       run: |