Fix build error for SE-0409

[kitwtnb]

SE-0409 , introduced in Swift 6, changes import from implicit public import to internal import.
The internal import does not allow imports to be public and will result in build errors, so public has been added.
https://github.com/swiftlang/swift-evolution/blob/main/proposals/0409-access-level-on-imports.md

[kitwtnb]

CI may need to build with Xcode 16 to resolve build errors. 🫤

[sindresorhus]

Swift 6 does not come with this setting on by default, and also, the point of it is to prefer internal import as much as possible.

[kitwtnb]

https://forums.swift.org/t/progress-toward-the-swift-6-language-mode/68315#the-swift-6-migration-2

There are a number of previously-accepted upcoming features that will be enabled by default in Swift 6

The forum states that it is enabled by default, but where can I find that it is disabled by default?

[sindresorhus]

I don't remember where I saw it, but you can see it in the Xcode beta: