Fix CI

[sobolevn]

Failing logs: https://github.com/typeddjango/django-stubs/runs/7834462015?check_suite_focus=true

[sobolevn]

I literally have 0 ideas what is going on.
It all works on my local machine.

[sobolevn]

Ok, I figured out that for some reason our CI does not see our stubs. So, everything is just Any.
But, why my local machine works?

At this pace I will be a cheff instead 🤦

[adamchainz]

Personally my backup is goat farmer, it'd be quieter.

[sobolevn]

I like the idea of a sandwich truck, something like this:

Goats are great as well 😆

[sobolevn]

Right now there are three things we can do:

1. Pin mypy<0.970 in pre-commit
2. Wait for 0.972, I am not sure that we can realease it any time soon
3. Find some wild way of solving MYPYPATH problems (even author of this feature has no idea what to do)

[adamchainz]

I would vote on pinning mypy<0.970 in CI, as a temporary fix, to allow further PR's to be merged. I'm using django-stubs with 0.971 myself and not having issues - afaiu the problem is limited to the CI setup.

[sobolevn]

🎉