Updated decoding of objects in object model. Fixed issues with Tests.

`images`, `available_markets` can not only be null, but have null elements. `name` can be `null`/missing for most objects. `type` can be corrupted for most objects. Fixed issues with tests.

Package.swift

@@ -1,11 +1,14 @@
-// swift-tools-version:5.5
+// swift-tools-version:5.6
 
 import PackageDescription
 
 let package = Package(
     name: "SpotifyAPI",
     platforms: [
-        .iOS(.v13), .macOS(.v10_15), .tvOS(.v13), .watchOS(.v6)
+        .iOS(.v13), 
+        .macOS(.v10_15),
+        .tvOS(.v13),
+        .watchOS(.v6)
     ],
     products: [
         .library(
@@ -71,24 +74,20 @@ var packageDependencies: [Package.Dependency] {
 
     var dependencies: [Package.Dependency] = [
         .package(
-            name: "RegularExpressions",
             url: "https://github.com/Peter-Schorn/RegularExpressions.git",
             from: "2.2.0"
         ),
         .package(
-            name: "swift-log",
             url: "https://github.com/apple/swift-log.git",
             from: "1.4.0"
         ),
         .package(
-            name: "OpenCombine",
             url: "https://github.com/OpenCombine/OpenCombine.git",
             from: "0.12.0"
         ),
         .package(
-            name: "swift-crypto",
             url: "https://github.com/apple/swift-crypto.git",
-            from: "1.1.3"
+            from: "3.0.0"
         ),
         .package(
             url: "https://github.com/apple/swift-docc-plugin",
@@ -99,17 +98,14 @@ var packageDependencies: [Package.Dependency] {
     #if TEST
     dependencies += [
         .package(
-            name: "vapor",
             url: "https://github.com/vapor/vapor.git",
             from: "4.45.3"
         ),
         .package(
-            name: "swift-nio",
             url: "https://github.com/apple/swift-nio.git",
             from: "2.27.0"
         ),
         .package(
-            name: "async-http-client",
             url: "https://github.com/swift-server/async-http-client.git",
             from: "1.2.5"
         )