Bump pytest-django from 3.5.1 to 3.7.0

Bumps [pytest-django](https://github.com/pytest-dev/pytest-django) from 3.5.1 to 3.7.0.
- [Release notes](https://github.com/pytest-dev/pytest-django/releases)
- [Changelog](https://github.com/pytest-dev/pytest-django/blob/master/docs/changelog.rst)
- [Commits](pytest-dev/pytest-django@v3.5.1...v3.7.0)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -37,7 +37,7 @@ flake8 = "^3.7"
 django-debug-toolbar = "^2.0"
 pytest = "^5.3"
 pytest-sugar = "^0.9.2"
-pytest-django = "^3.4"
+pytest-django = "^3.7"
 pytest-xdist = "^1.28"
 black = "^19.3b0"
 model-mommy = "^1.6"