Update manifold-swift to 0.4.0

Author: tomasf

Package.swift

@@ -8,7 +8,7 @@ let package = Package(
         .library(name: "Cadova", targets: ["Cadova"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/tomasf/manifold-swift.git", .upToNextMinor(from: "0.2.3")),
+        .package(url: "https://github.com/tomasf/manifold-swift.git", .upToNextMinor(from: "0.4.0")),
         .package(url: "https://github.com/tomasf/ThreeMF.git", .upToNextMinor(from: "0.2.0")),
         .package(url: "https://github.com/tomasf/Apus.git", .upToNextMinor(from: "0.1.1")),
     ],