Fixed #31575 -- Added system check for admin sidebar request context processor dependency.

Co-authored-by: Carlton Gibson <carlton.gibson@noumenal.es>

tests/auth_tests/settings.py

@@ -11,6 +11,7 @@ AUTH_TEMPLATES = [{
     'APP_DIRS': True,
     'OPTIONS': {
         'context_processors': [
+            'django.template.context_processors.request',
             'django.contrib.auth.context_processors.auth',
             'django.contrib.messages.context_processors.messages',
         ],