build(deps): bump pytest from 3.5.1 to 6.1.1 (#703)

Bumps [pytest](https://github.com/pytest-dev/pytest) from 3.5.1 to 6.1.1.
- [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/3.5.1...6.1.1)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements.txt

@@ -11,7 +11,7 @@ flake8-tidy-imports==1.1.0
 # A mature full-featured Python testing tool.
 # License: MIT
 # Upstream url: http://pytest.org/
-pytest==3.5.1
+pytest==6.1.1
 
 # Pytest plugin for measuring coverage.
 # License: MIT