corrected pytest_runner settings

.github/workflows/pytest_runner.yml

@@ -12,7 +12,7 @@ jobs:
       with:
         python-version: '3.10'
     - name: Install dependencies
-      run:  pip install -r requirements.txt
+      run:  pip install -r dev-requirements.txt
     - name: Test with pytest
       run:
         pytest -v --pycodestyle