Bump pytest from 5.2.0 to 5.3.1

Bumps [pytest](https://github.com/pytest-dev/pytest) from 5.2.0 to 5.3.1.
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/5.3.1/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@5.2.0...5.3.1)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -35,7 +35,7 @@ ipython = "^7.8"
 isort = "^4.3"
 flake8 = "^3.7"
 django-debug-toolbar = "^2.0"
-pytest = "^5.2"
+pytest = "^5.3"
 pytest-sugar = "^0.9.2"
 pytest-django = "^3.4"
 pytest-xdist = "^1.28"