ci: run with latest pytest and pytest-django versions

tox.ini

@@ -19,8 +19,6 @@ envlist =
   authentic-py3-dj22-drf39
 
 [testenv]
-whitelist_externals =
-  /bin/mv
 setenv =
 
   authentic: AUTHENTIC2_SETTINGS_FILE=tests/settings.py
@@ -54,10 +52,10 @@ deps =
   psycopg2-binary
   coverage
   pytest-cov
-  pytest-django<3.4.6
+  pytest-django
   pytest-random
   mock
-  pytest<5
+  pytest!=5.3.3
   lxml
   cssselect
   django-webtest
@@ -118,6 +116,7 @@ filterwarnings =
   ignore:parameter codeset is deprecated::django.utils.translation.trans_real
 # remind us later
   once:.*staticfiles.*::django\..*
+  once
 junit_family=xunit2
 
 [coverage:run]