ImportError while importing test module '/var/lib/jenkins/workspace/DOBJS/tests-on-diff/.tox/py3/lib/python3.7/site-packages/swh/objstorage/tests/test_objstorage_instantiation.py'. Hint: make sure your test modules/packages have valid Python names. Traceback: /usr/lib/python3.7/importlib/__init__.py:127: in import_module return _bootstrap._gcd_import(name[level:], package, level) .tox/py3/lib/python3.7/site-packages/swh/objstorage/tests/test_objstorage_instantiation.py:10: in <module> from swh.objstorage.api.client import RemoteObjStorage .tox/py3/lib/python3.7/site-packages/swh/objstorage/api/client.py:9: in <module> from swh.objstorage.interface import ObjStorageInterface .tox/py3/lib/python3.7/site-packages/swh/objstorage/interface.py:6: in <module> from typing import Dict, Protocol, runtime_checkable E ImportError: cannot import name 'Protocol' from 'typing' (/usr/lib/python3.7/typing.py)