Use SwiftSyntax 602.0.0

No changes required?

Author: helje5

Package.swift

@@ -17,7 +17,7 @@ let package = Package(
   ],
   dependencies: [
     .package(url: "https://github.com/swiftlang/swift-syntax.git",
-             from: "601.0.1")
+             from: "602.0.0")
   ],
   targets: [
     .target(