ci: remove useless Unit tests step

Unit tests are already run by the Code coverage step (renamed to Unit
tests)

.github/workflows/pythonapp.yml

@@ -17,9 +17,6 @@ jobs:
         pip install --upgrade pip pipenv
         pipenv sync -d
     - name: Unit tests
-      run: |
-        pipenv run python -m unittest -v test
-    - name: Code coverage
       run: |
         pipenv run python -m coverage run -m unittest test
         pipenv run codecov --token=${{ secrets.CODECOV_TOKEN }}