pytest update

Author: jtsodapop

tox.ini

@@ -6,7 +6,7 @@ envlist = py36, py37, py38
 # install pytest in the virtualenv where commands will be executed
 deps =
     -rrequirements.txt
-    pytest
+    pytest < 7.0.0
     pytest-cases
 passenv = LABELBOX_TEST_API_KEY_PROD LABELBOX_TEST_API_KEY_STAGING LABELBOX_TEST_ENVIRON
 commands = pytest {posargs}