fix(CICD): trying to get unit tests to run again

.github/workflows/python-package.yml

@@ -35,6 +35,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install --use-deprecated=legacy-resolver -e .[dev]
+        pip install pytest
 
     - name: Lint with Ruff
       run: |