Cleanup Package.swift, lower requirements

For some reason iOS 13 seems to be the minimum in SwiftSyntax,
not quite sure why.

Author: helje5

Package.swift

@@ -5,16 +5,12 @@ import CompilerPluginSupport
 let package = Package(
   name: "ManagedModels",
 
-  // For now :-)
-  // macOS v13 needed to build the macro on macOS 13! (for iOS)
-  platforms: [ .macOS(.v11), .iOS(.v14), .tvOS(.v15), .watchOS(.v8) ],
+  platforms: [ .macOS(.v11), .iOS(.v13), .tvOS(.v13), .watchOS(.v6) ],
   products: [
     .library(name: "ManagedModels", targets: [ "ManagedModels" ])
   ],
   dependencies: [
-    // Depend on the latest Swift 5.9 prerelease of SwiftSyntax
-    .package(url: "https://github.com/apple/swift-syntax.git", 
-             from: "509.0.0-swift-5.9-DEVELOPMENT-SNAPSHOT-2023-04-25-b"),
+    .package(url: "https://github.com/apple/swift-syntax.git", from: "509.0.0")
   ],
   targets: [
     .target(name: "ManagedModels", dependencies: [ "ManagedModelMacros" ]),
@@ -27,13 +23,11 @@ let package = Package(
       ]
     ),
 
-    // A test target used to develop the macro implementation.
     .testTarget(
       name: "ManagedModelTests",
       dependencies: [ "ManagedModels" ]
     ),
 
-    // A test target used to develop the macro implementation.
     .testTarget(
       name: "ManagedModelMacrosTests",
       dependencies: [

Sources/ManagedModels/SwiftUI/ModelContainer+SwiftUI.swift

@@ -65,6 +65,7 @@ public extension View {
   }
 }
 
+@available(iOS 14.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
 public extension Scene {
 
   @inlinable

Sources/ManagedModels/SwiftUI/ModelContext+SwiftUI.swift

@@ -24,6 +24,7 @@ public extension View {
   }
 }
 
+@available(iOS 14.0, macOS 10.15, tvOS 13.0, watchOS 6.0, *)
 public extension Scene {
 
   @inlinable

Tests/ManagedModelMacrosTests/ManagedModelMacrosTests.swift

@@ -282,7 +282,7 @@ final class ModelMacroTests: XCTestCase {
       """
     ))
 
-    #if true
+    #if false
     print("Exploded:---\n")
     print(explodedSource)
     print("\n-----")