Update python-package.yml

installation of requirements_ci.txt as part of the workflow

.github/workflows/python-package.yml

@@ -28,7 +28,8 @@ jobs:
  run: |
  python -m pip install --upgrade pip
  python -m pip install flake8 pytest
- if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+ pip install -r requirements.txt
+ pip install -r requirements_ci.txt
  - name: Lint with flake8
  run: |
  # stop the build if there are Python syntax errors or undefined names