Update pytest-mock to 1.6.3

[pyup-bot]

There's a new version of pytest-mock available.
You are currently using 1.6.0. I have updated it to 1.6.3

These links might come in handy: PyPI | Changelog | Repo

Changelog

1.6.3

---

• Fix UnicodeDecodeError during assert introspection in assert_called_with in Python 2.
  Thanks AndreasHogstrom_ for the report (91_).

.. _AndreasHogstrom: https://github.com/AndreasHogstrom

.. _91: pytest-dev/pytest-mock#91

1.6.2

---

• Provide source package in tar.gz format and remove obsolete MANIFEST.in.

1.6.1

---

• Fix mocker.resetall() by ignoring mocker objects which don't have a
  resetall method, like for example patch.dict.
  Thanks jdavisp3_ for the PR (88_).

.. _jdavisp3: https://github.com/jdavisp3

.. _88: pytest-dev/pytest-mock#88

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖