fixed tests for stable 3.8

.github/workflows/build-release-stable.yml

@@ -25,7 +25,7 @@ jobs:
  sudo apt-get install libkrb5-dev
  python -m pip install --upgrade pip
  pip install pytest pylint #flake8
- if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+ if [ -f build/requirements/linux.txt ]; then pip install -r build/requirements/linux.txt; fi
  # - name: Lint with flake8
  # run: |
  # # stop the build if there are Python syntax errors or undefined names