Made the test initializers package-visible.

Tests/ASConnectService/Cases/Public/Providers/APIKeyTokenProviderTests.swift

@@ -17,8 +17,8 @@ import CryptoKit
 import Foundation
 import Testing
 
-// A testable import gives access to the initializer that injects the current date.
-@testable import ASConnectService
+// A non-testable import ensures that the provider can be created from outside the module.
+import ASConnectService
 
 @Suite("APIKeyTokenProvider")
 struct APIKeyTokenProviderTests {