CI: use compiled nightly mypy

[twoertwein]

See microsoft/pyright#6044 (comment)

[Dr-Irv]

thanks @twoertwein

[twoertwein]

Not bad, from 3min46 to 1min17 :)

[Dr-Irv]

Not bad, from 3min46 to 1min17 :)

Yes. Unfortunately, the mypy nightly job is failing because we need to add a # type: ignore[misc] in Series.__new__(), but if we do that, then the regular CI with mypy 1.5.1 will fail.

[twoertwein]

I'm unsure whether we can fix that issue by re-writing the overloads. In the worst case, we could ignore overload-specific ignores on the nightly run (we already ignore unused ignore comments).