Add missing availability annotations to tests

Author: mattt

Tests/HuggingFaceTests/OAuthTests/HuggingFaceAuthenticationManagerTests.swift

@@ -5,6 +5,7 @@ import Testing
 
 #if swift(>=6.1)
     @Suite("HuggingFace Authentication Manager Tests")
+    @available(macOS 14.0, macCatalyst 17.0, iOS 17.0, watchOS 10.0, tvOS 17.0, *)
     struct HuggingFaceAuthenticationManagerTests {
         @Test("HuggingFaceAuthenticationManager can be initialized with valid parameters")
         @MainActor
@@ -92,6 +93,7 @@ import Testing
 #endif  // swift(>=6.1)
 
 @Suite("Hugging Face OAuth Scope Tests", .serialized)
+@available(macOS 14.0, macCatalyst 17.0, iOS 17.0, watchOS 10.0, tvOS 17.0, *)
 struct HuggingFaceScopeTests {
     typealias Scope = HuggingFaceAuthenticationManager.Scope