chore: Update toon-swift to 0.4.0 (#57)

Deterministic dictionary key ordering, recursion limit protection,
and numeric normalization strategies.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: alexey1312

Package.resolved

@@ -12,7 +12,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-argument-parser", from: "1.0.0"),
-        .package(url: "https://github.com/toon-format/toon-swift.git", from: "0.3.0"),
+        .package(url: "https://github.com/toon-format/toon-swift.git", from: "0.4.0"),
         .package(url: "https://github.com/swiftlang/swift-docc-plugin", from: "1.4.5"),
         .package(url: "https://github.com/mattt/swift-toml", from: "2.0.0"),
     ],