Update to support a different version of swift-syntax (#4)

Author: heoblitz

Package.swift

@@ -18,7 +18,7 @@ let package = Package(
     ),
   ],
   dependencies: [
-    .package(url: "https://github.com/swiftlang/swift-syntax.git", from: "600.0.0-latest"),
+    .package(url: "https://github.com/swiftlang/swift-syntax", "509.0.0"..<"602.0.0"),
   ],
   targets: [
     .macro(