build(deps): bump pytest-mock from 3.4.0 to 3.5.1 (#862)

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.4.0 to 3.5.1.
- [Release notes](https://github.com/pytest-dev/pytest-mock/releases)
- [Changelog](https://github.com/pytest-dev/pytest-mock/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest-mock/compare/v3.4.0...v3.5.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements.txt

@@ -26,7 +26,7 @@ mock==4.0.3
 # Thin-wrapper around the mock package for easier use with py.test.
 # License: MIT
 # Upstream url: https://pypi.python.org/pypi/pytest-mock
-pytest-mock==3.4.0
+pytest-mock==3.5.1
 
 # Mypy is an optional static type checker for Python.
 # License: MIT