[ci] Upgraded openwisp-users

Author: pandafy

.github/workflows/ci.yml

@@ -74,6 +74,7 @@ jobs:
           pip install -U pip wheel setuptools
           pip install -U -r requirements-test.txt
           pip install -e .[saml,openvpn_status]
+          pip install --upgrade --no-deps --no-cache-dir "https://github.com/openwisp/openwisp-users/tarball/issues/497-export-users"
           pip install ${{ matrix.django-version }}
 
       - name: Start InfluxDB and Redis container