install pytest in actions

.github/workflows/tests.yml

@@ -34,7 +34,7 @@ jobs:
  - name: Install dependencies
  run: |
  python -m pip install --upgrade pip
- pip install pandas==1.3.5 numpy==1.22.3 tqdm==4.62.3 psutil==5.9.0
+ pip install pytest
  pip install .
  
  - name: Test with pytest