Fix available version to match usage

Author: daymxn

FirebaseAI/Sources/Types/Public/Live/LiveSession.swift

@@ -21,7 +21,7 @@ import Foundation
 /// through the incremental API (such as ``sendContent(_:turnComplete:)``).
 ///
 /// To create an instance of this class, see ``LiveGenerativeModel``.
-@available(macOS 12.0, *)
+@available(iOS 15.0, macOS 12.0, macCatalyst 15.0, tvOS 15.0, watchOS 8.0, *)
 public final class LiveSession: Sendable {
   private let service: LiveSessionService