Possible typo for `AsyncAlgorithms_v1_3` in `Package.swift `

In the `#else` block in `Package.swift`, `AsyncAlgorithms_v1_3` contains `1.2`; is it supposed to contain `1.3` instead?

```swift
let AsyncAlgorithms_v1_3 = "AvailabilityMacro=AsyncAlgorithms 1.2:macOS 15.0, iOS 18.0, tvOS 18.0, watchOS 11.0"
```

Open Package.swift and inspect the #else block containing AsyncAlgorithms_v1_3. Compare the constant name with its availability string, correct the version mismatch if confirmed, and verify that the package manifest still parses successfully.

Written by the indexing model from the issue text.