Remove explicit macOS platform requirement

SPM fails in this commit, we'll fix it in the next.
Leaving it in this state for demonstration purposes.

Author: mokagio

Package.swift

@@ -4,11 +4,7 @@ import PackageDescription
 
 let package = Package(
     name: "WordPressKit",
-    platforms: [
-        .iOS(.v13),
-        // The package(s) are meant for iOS only, but the use of the SwiftLint plugin down the dependency chain requires specifying a compatible macOS version.
-        .macOS(.v12),
-    ],
+    platforms: [.iOS(.v13)],
     products: [
         .library(name: "APIInterface", targets: ["APIInterface"]),
         .library(name: "CoreAPI", targets: ["CoreAPI"]),