wip: Work around Hummingbird thread safety issue 574

Author: euanh

Examples/HelloWorldHummingbird/Package.resolved

@@ -20,7 +20,7 @@ let package = Package(
     name: "hello-world",
     platforms: [.macOS(.v14)],
     dependencies: [
-        .package(url: "https://github.com/hummingbird-project/hummingbird.git", from: "2.0.0"),
+        .package(url: "https://github.com/hummingbird-project/hummingbird.git", branch: "main"),
         .package(url: "https://github.com/apple/swift-container-plugin", from: "0.1.0"),
     ],
     targets: [