Bump pytest from 5.4.3 to 6.0.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.4.3 to 6.0.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.4.3...6.0.1)

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

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -23,7 +23,7 @@ pygithub==1.51
 pylint==2.5.3  # Lint
 pyroma==2.6  # Packaging best practices checker
 pytest-cov==2.10.0  # Measure code coverage
-pytest==5.4.3  # Test runners
+pytest==6.0.1  # Test runners
 sphinx-autodoc-typehints==1.11.0
 sphinxcontrib-spelling==5.2.0
 twine==3.2.0