bugfix: missing dependencies for stage II

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip
-          pip install flake8 pytest pytest-cov
+          pip install flake8
 
       - name: Lint with flake8
         run: |
@@ -40,6 +40,11 @@ jobs:
         uses: actions/setup-python@v3
         with:
           python-version: '3.x'
+
+       - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install pytest pytest-cov
 
       - name: Run tests with pytest
         run: |