Remove @preconcurrency from sample files (#355)

Author: markmur

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/App/AppDelegate.swift

@@ -1,4 +1,4 @@
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 import UIKit
 
 func getLogLevel(key: String) -> LogLevel {

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/App/CheckoutCoordinator.swift

@@ -1,5 +1,5 @@
 import OSLog
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 import ShopifyCheckoutProtocol
 import UIKit
 

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/App/SceneDelegate.swift

@@ -1,5 +1,5 @@
 import Combine
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 import SwiftUI
 import UIKit
 

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/Lib/KeychainHelper.swift

@@ -1,6 +1,6 @@
 import Foundation
 import Security
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 
 struct OAuthTokenResult: Codable {
     let accessToken: String

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/Scenes/Cart/CartViewController.swift

@@ -1,6 +1,6 @@
 import ApolloAPI
 import Combine
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 import ShopifyCheckoutProtocol
 import SwiftUI
 import UIKit

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/Scenes/CustomerAccounts/CustomerAccountManager.swift

@@ -1,6 +1,6 @@
 import CommonCrypto
 import Foundation
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 
 enum CustomerAccountError: LocalizedError {
     case missingConfiguration

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/Scenes/Logs/LogsView.swift

@@ -1,4 +1,4 @@
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 import SwiftUI
 
 struct LogsView: View {

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/Scenes/ProductView.swift

@@ -1,7 +1,7 @@
 import Apollo
 import ApolloAPI
 import ShopifyAcceleratedCheckouts
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 import SwiftUI
 import UIKit
 

platforms/swift/Samples/CheckoutKitSwiftDemo/CheckoutKitSwiftDemo/Sources/Scenes/SettingsView.swift

@@ -1,6 +1,6 @@
 import Combine
 import PassKit
-@preconcurrency import ShopifyCheckoutKit
+import ShopifyCheckoutKit
 import SwiftUI
 
 enum AppStorageKeys: String {