[mod] Update dependencies. In particular:

Click https://click.palletsprojects.com/en/7.x/changelog/#version-7-1-2
 - Fix test: the error message changed from double to simple cotes
PyNaCl: https://github.com/pyca/pynacl/blob/master/CHANGELOG.rst#140-2020-05-25
Pytest: https://docs.pytest.org/en/latest/changelog.html#pytest-5-4-3-2020-06-02