Crash while using `django-stubs-ext@0.3.0`

[sobolevn]

Bug report

What's wrong

Traceback (most recent call last):
  File "manage.py", line 31, in <module>
    main()
  File "manage.py", line 27, in main
    management.execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 336, in run_from_argv
    connections.close_all()
  File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 219, in close_all
    for alias in self:
  File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 213, in __iter__
    return iter(self.databases)
  File "/usr/local/lib/python3.8/site-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 147, in databases
    self._databases = settings.DATABASES
  File "/usr/local/lib/python3.8/site-packages/django/conf/__init__.py", line 79, in __getattr__
    self._setup(name)
  File "/usr/local/lib/python3.8/site-packages/django/conf/__init__.py", line 66, in _setup
    self._wrapped = Settings(settings_module)
  File "/usr/local/lib/python3.8/site-packages/django/conf/__init__.py", line 157, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/local/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/code/server/settings/__init__.py", line 14, in <module>
    import django_stubs_ext
  File "/usr/local/lib/python3.8/site-packages/django_stubs_ext/__init__.py", line 2, in <module>
    from .annotations import Annotations as Annotations
  File "/usr/local/lib/python3.8/site-packages/django_stubs_ext/annotations.py", line 4, in <module>
    from typing_extensions import Annotated
ModuleNotFoundError: No module named 'typing_extensions'

How is that should be

It should specify typing_extensions as a direct dependency.
https://github.com/wemake-services/wemake-django-template/pull/1701/checks?check_run_id=3520533788

System information

• OS:
• python version: 3.8
• django version: 2.2
• mypy version: 0.910
• django-stubs version: 1.8.0
• django-stubs-ext version: 0.3.0