Bump swift-syntax to 602.0.0 and swift-macro-testing to match. (#38)

Author: willtemperley

Package.swift

@@ -27,10 +27,10 @@ let package = Package(
     .package(
       url: "https://github.com/apple/swift-argument-parser", from: "1.3.0"),
     .package(
-      url: "https://github.com/swiftlang/swift-syntax.git", from: "600.0.1"),
+      url: "https://github.com/swiftlang/swift-syntax.git", from: "602.0.0"),
     .package(
       url: "https://github.com/pointfreeco/swift-macro-testing.git",
-      from: "0.5.2"),
+      from: "0.6.4"),
     .package(
       url: "https://github.com/swiftlang/swift-docc-plugin", from: "1.0.0"),
   ],