Update dependency pytest-mock to v3.8.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pytest-mock	3.7.0 -> 3.8.1

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Release Notes

pytest-dev/pytest-mock

v3.8.1

Compare Source

• Fix regression caused by an explicit mock dependency in the code (#298_).

.. _#&#820https://github.com/pytest-dev/pytest-mock/issues/298ues/298

v3.8.0

Compare Source

• Add MockerFixture.async_mock method. Thanks @PerchunPak_ for the PR (#296_).

.. _@​PerchunPak: https://github.com/PerchunPak
.. [https://github.com/pytest-dev/pytest-mock/pull/296](https://togithub.com/pytest-dev/pytest-mock/pull/296)-mock/pull/296

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[coveralls]

Coverage decreased (-0.03%) to 42.109% when pulling 852b846 on renovate/pytest-mock-3.x into 27e2599 on development.