Bump pytest-cov from 2.6.0 to 2.6.1 in /flowauth

Bumps [pytest-cov](https://github.com/pytest-dev/pytest-cov) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/pytest-dev/pytest-cov/releases)
- [Changelog](https://github.com/pytest-dev/pytest-cov/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest-cov@v2.6.0...v2.6.1)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Author: dependabot-support