Update pytest.yml

.github/workflows/pytest.yml

@@ -18,7 +18,7 @@ jobs:
         run: |  
           python -m pip install --upgrade pip  
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi;
-          pip install pytest
+          pip install pytest pytest-cov
       - name: Lint with Ruff  
         run: |  
           pip install ruff