Bump pytest from 6.1.2 to 6.2.0

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.1.2 to 6.2.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/pytest-dev/pytest/compare/6.1.2...6.2.0)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements-tests.txt

 -r requirements.txt
 attrs==20.3.0
-pytest==6.1.2
+pytest==6.2.0
 pytest-cov==2.10.1
 mock==2.0.0
 flake8==3.8.4