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] <support@github.com>

requirements_dev.txt

@@ -1,7 +1,7 @@
 coveralls==2.1.2
 mock==3.0.5
 pip==20.2.3
-pytest==6.0.1
+pytest==6.1.0
 pytest-cov==2.10.1
 pytest-timeout==1.4.2
 setuptools==50.3.0