Bump mypy from 0.770 to 0.780
Bump mypy from 0.770 to 0.780

Bumps [mypy](https://github.com/python/mypy) from 0.770 to 0.780.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](https://github.com/python/mypy/compare/v0.770...v0.780)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
rremizov/django-random-queryset