Bump pytest-mock from 3.4.0 to 3.5.0 (#284)

Bumps [pytest-mock](https://github.com/pytest-dev/pytest-mock) from 3.4.0 to 3.5.0.
- [Release notes](https://github.com/pytest-dev/pytest-mock/releases)
- [Changelog](https://github.com/pytest-dev/pytest-mock/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-mock@v3.4.0...v3.5.0)

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Author: dependabot[bot]