Update django-stubs to 1.9.0 (#3439)

Co-authored-by: Bruno Alla <alla.brunoo@gmail.com>

{{cookiecutter.project_slug}}/requirements/local.txt

@@ -14,7 +14,7 @@ watchgod==0.7  # https://github.com/samuelcolvin/watchgod
 # Testing
 # ------------------------------------------------------------------------------
 mypy==0.910  # https://github.com/python/mypy
-django-stubs==1.8.0  # https://github.com/typeddjango/django-stubs
+django-stubs==1.9.0  # https://github.com/typeddjango/django-stubs
 pytest==6.2.5  # https://github.com/pytest-dev/pytest
 pytest-sugar==0.9.4  # https://github.com/Frozenball/pytest-sugar
 {%- if cookiecutter.use_drf == "y" %}

{{cookiecutter.project_slug}}/{{cookiecutter.project_slug}}/users/tests/test_views.py

@@ -4,7 +4,7 @@ from django.contrib import messages
 from django.contrib.auth.models import AnonymousUser
 from django.contrib.messages.middleware import MessageMiddleware
 from django.contrib.sessions.middleware import SessionMiddleware
-from django.http import HttpRequest
+from django.http import HttpRequest, HttpResponseRedirect
 from django.test import RequestFactory
 from django.urls import reverse
 
@@ -97,5 +97,6 @@ class TestUserDetailView:
         response = user_detail_view(request, username=user.username)
         login_url = reverse(settings.LOGIN_URL)
 
+        assert isinstance(response, HttpResponseRedirect)
         assert response.status_code == 302
         assert response.url == f"{login_url}?next=/fake-url/"