Release 0.780 planning

[ilevkivskyi]

I am going to release mypy 0.780 on Tuesday, June 2. I will cut the release branch later today or tomorrow. Please mention here any PRs that need to be cherry-picked.

[ilevkivskyi]

It looks like typeshed needs some fixes (and reverts), I will submit tomorrow.

[ilevkivskyi]

After all it looks like there was just one real issue with typeshed that is now fixed. Unless we will discover some more issues internally, I am going to use 42d5077 as the release branch base.

[ilevkivskyi]

Release branch is cut as planned (and is tested internally for few days). I am going to proceed with the release.

[ilevkivskyi]

I just released 0.781 with a minor wheel fix. Here are things to include in 0.782:

• More wheel fixes in add release tester #8963
• False positive for literal bool overlap: Don't consider comparing True and False as a dangerous comparison #9021
• (?) A fix for zip()-related perf regression: @JukkaL is investigating