Update tests.yml

.github/workflows/tests.yml

@@ -38,7 +38,7 @@ jobs:
           python -m pip install setuptools
           if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
           python -m pip install pytest pytest-cov pytest-html ruff cheroot wsgidav
-          # python -m pip install psutil stressor-ps
+          python -m pip install psutil stressor-ps
           pip list
 
       - name: Lint with ruff