Add macOS 14 as a platform for Modules to avoid swift build error

By default, Package Manager sets 10.13 as the default macOS platform,
but that's not compatible with the requirements of some of the
dependencies. Example:

```
error: the library 'WordPressCore' requires macos 10.13, but depends on the product 'WordPressAPI' which requires macos 12.0; consider changing the library 'WordPressCore' to require macos 12.0 or later, or the product 'WordPressAPI' to require macos 10.13 or earlier.
```

Set 14 because that's what GutenberKit requires:

```
error: the library 'XcodeTarget_App' requires macos 10.13, but depends on the product 'GutenbergKit' which requires macos 14.0; consider changing the library 'XcodeTarget_App' to require macos 14.0 or later, or the product 'GutenbergKit' to require macos 10.13 or earlier.
```

Author: mokagio

Modules/Package.swift

@@ -6,6 +6,7 @@ let package = Package(
     name: "Modules",
     platforms: [
         .iOS(.v16),
+        .macOS(.v14), // Here just to avoid errors when building directly with `swift build`
     ],
     products: XcodeSupport.products + [
         .library(name: "AsyncImageKit", targets: ["AsyncImageKit"]),