Bump pytest from 6.0.1 to 6.1.0

Bumps [pytest](https://github.com/pytest-dev/pytest) from 6.0.1 to 6.1.0.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@6.0.1...6.1.0)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements_dev.txt

@@ -3,7 +3,7 @@ coverage==5.2.1
 flake8==3.8.3
 mock==3.0.5
 pip==20.2.2
-pytest==6.0.1
+pytest==6.1.0
 Sphinx==3.2.1
 tox==3.20.0
 twine==1.15.0