Use wider swift-syntax range

Author: xtyxtyx

Package.resolved

@@ -21,7 +21,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/jpsim/Yams.git", "5.0.0"..<"5.4.0"),
-        .package(url: "https://github.com/swiftlang/swift-syntax.git", from: "602.0.0"),
+        .package(url: "https://github.com/swiftlang/swift-syntax.git", "600.0.0"..<"603.0.0"),
     ],
     targets: [
         .target(