force the upgrade of pip packages

.gitlab-ci.yml

@@ -17,9 +17,9 @@ unit tests:
     script:
         - virtualenv -p python3 env
         - source ./env/bin/activate
-        - pip install -r requirements.txt
-        - pip install -r requirements-dev.txt
-        - pip install -r requirements-tests.txt
+        - pip install -U -r requirements.txt
+        - pip install -U -r requirements-dev.txt
+        - pip install -U -r requirements-tests.txt
         - echo "DEBUG = True" > ./project/settings/env.py
         - echo "SECRET_KEY = '$(pwgen 20 1)'" >> ./project/settings/env.py
         - ./manage.py migrate --run-syncdb