Swift6 testing (swiftlang#19)

* quickpass update, not complete (swiftlang#18)

* quickpass update, not complete

* applying default swift format

* using isEmpty in test

* using a marker class to identify the bundle and load it for the macOS executable location

* using version 4 of the deck and playingcards

Author: heckj

Package.swift

@@ -25,7 +25,7 @@ let package = Package(
     dependencies: [
         .package(
             url: "https://github.com/apple/example-package-deckofplayingcards.git",
-            from: "3.0.0"),
+            from: "4.0.0"),
         .package(
             url: "https://github.com/apple/swift-argument-parser.git",
             from: "1.6.0"),