Update mock to 4.0.2

[pyup-bot]

This PR updates mock from 4.0.1 to 4.0.2.

Changelog

4.0.2

-----

- Issue 39915: Ensure :attr:`unittest.mock.AsyncMock.await_args_list` has
call objects in the order of awaited arguments instead of using
:attr:`unittest.mock.Mock.call_args` which has the last value of the call.
Patch by Karthikeyan Singaravelan.

Links

• PyPI: https://pypi.org/project/mock
• Changelog: https://pyup.io/changelogs/mock/
• Docs: http://mock.readthedocs.org/en/latest/

[pyup-bot]

Closing this in favor of #511