fix: fix PEP 646 support of tuple unpacking

[terencehonles]

Description

This change fixes unpacking a tuple or generic type when *args is a type variable tuple.

Checklist - did you ...

• Add an entry in CHANGES.md if necessary?
• Add / update tests if necessary?
• Add new / update outdated documentation?

[JelleZijlstra]

Thanks, this is a good catch. However, as it is a change in style, it should be applied only to Black's preview style.

[terencehonles]

Thanks, this is a good catch. However, as it is a change in style, it should be applied only to Black's preview style.

Guidance on that probably would have been useful, but I believe I may have figured it out

[JelleZijlstra]

Thanks!

[github-actions]

diff-shades reports zero changes comparing this PR (fd311b9) to main (699b45a).

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What is this? | Workflow run | diff-shades documentation

[JelleZijlstra]

There's a CI failure that looks unrelated to your change, probably due to a typing change in a dependency. I can look into it over the next few days.

[terencehonles]

There's a CI failure that looks unrelated to your change, probably due to a typing change in a dependency. I can look into it over the next few days.

I fixed the last lint error by updating the schema

[JelleZijlstra]

Thank you!