CI: Overwrite nbxmpp from site-packages

.gitlab-ci.yml

@@ -13,7 +13,7 @@ run-tests:
     - virtualenv --system-site-packages civenv
     - . ./civenv/bin/activate
     - pip3 install mypy
-    - pip3 install git+https://dev.gajim.org/gajim/python-nbxmpp.git@master
+    - pip3 install git+https://dev.gajim.org/gajim/python-nbxmpp.git@master --upgrade
     - pip3 install pylint==2.3.1
     - /home/gitlab-runner/.local/bin/mypy gajim
     - scripts/dev/pylint-ci.sh --jobs=2 gajim