Update pytest-django requirement from <4,>=3.5 to >=3.5,<5

Updates the requirements on [pytest-django](https://github.com/pytest-dev/pytest-django) to permit the latest version.
- [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@v3.5.0...v4.5.2)

---
updated-dependencies:
- dependency-name: pytest-django
  dependency-type: direct:development
...

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

Author: dependabot[bot]

setup.py

@@ -23,7 +23,7 @@ def run(self):
 extras_require = {
     'test': [
         'pytest>=5.1,<7',
-        'pytest-django>=3.5,<4',
+        'pytest-django>=3.5,<5',
     ],
     'lint': [
         'flake8>=3.7,<5',