Test Django main against git master of django-rest-framework

Running against Django 4.2(dev) requires the fix encode/django-rest-framework#8556

.github/workflows/test.yml

@@ -82,6 +82,7 @@ jobs:
             postgres: 'postgres:12'
           - python: '3.10'
             django: 'git+https://github.com/django/django.git@main#egg=Django'
+            install_extras: 'pip install git+https://github.com/encode/django-rest-framework.git@main#egg=django-rest-framework'
             experimental: true
             postgres: 'postgres:12'