Bump pytest from 5.2.4 to 5.3.3

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.2.4 to 5.3.3.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/master/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.2.4...5.3.3)

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

requirements-dev.txt

@@ -2,7 +2,7 @@ black==19.10b0
 coveralls==1.8.2
 ddt==1.2.1
 flake8-import-order==0.18.1
-pytest==5.2.4
+pytest==5.3.3
 pytest-cov==2.8.1
 pytest-json==0.4.0
 pytest-pythonpath==0.7.3