false `Sendable` warning if SE-299 (Extending Static Member Lookup in Generic Contexts) is used

[dnadoba]

Description
The following code produces a false positive Sendable warning Converting non-sendable function value to '@Sendable () async throws -> ()' may introduce data races if FooProtocol.make(_:) is called though static member lookup instead of on the concrete type:

public protocol FooProtocol {}
struct FooConcrete: FooProtocol {}

extension FooProtocol where Self == FooConcrete {
    static func make(
        _ body: @escaping @Sendable () async throws -> ()
    ) -> FooConcrete {
        FooConcrete()
    }
}

func baz1() -> some FooProtocol {
    .make {} // warning: Converting non-sendable function value to '@Sendable () async throws -> ()' may introduce data races
}

func baz2() -> some FooProtocol {
    FooConcrete.make {} // no warning
}

Steps to reproduce
compile the code above

Expected behavior
no warning

Environment

• Swift compiler version info: swift-driver version: 1.75.2 Apple Swift version 5.8 (swiftlang-5.8.0.122.1 clang-1403.0.22.11.100)
• Xcode version info: Version 14.3 beta 3 (14E5215c)

also tested with Swift 5.7.2 (5.7.2.135.5) and it produces the same warning