## Description

Attempting to use Celery in a mypy enabled project we found that errors in Celery's type annotations prevent mypy running against our code. Basically this https://stackoverflow.com/questions/68114378/mypy-crashes-due-to-syntax-error-in-underlying-modules situation 

This branch doesn't attempt to fully overhaul the annotations; it just makes it possible to 

```
from celery import Celery
from celery.schedules import crontab
```
successfully.
Correct some mypy errors. ## Description

Attempting to use Celery in a mypy enabled project we found that errors in Celery's type annotations prevent mypy running against our code. Basically this https://stackoverflow.com/questions/68114378/mypy-crashes-due-to-syntax-error-in-underlying-modules situation 

This branch doesn't attempt to fully overhaul the annotations; it just makes it possible to 

```
from celery import Celery
from celery.schedules import crontab
```
successfully.
#!/usr/bin/env python

from django.core.management import execute_manager

try:
    import settings  # Assumed to be in the same directory.
except ImportError:
    import sys
    sys.stderr.write(
        "Error: Can't find the file 'settings.py' in the directory "
        "containing {!r}.".format(__file__))
    sys.exit(1)

if __name__ == '__main__':
    execute_manager(settings)

#!/usr/bin/env python

from django.core.management import execute_manager

try:
    import settings  # Assumed to be in the same directory.
except ImportError:
    import sys
    sys.stderr.write(
        "Error: Can't find the file 'settings.py' in the directory "
        "containing {!r}.".format(__file__))
    sys.exit(1)

if __name__ == '__main__':
    execute_manager(settings)
