fix: Use NSDictionary for Objective-C compatibility in event listeners

Changed callback parameter types from [String: Any?] to NSDictionary
in addPurchaseUpdatedListener and addPurchaseErrorListener to ensure
Objective-C compatibility for Kotlin Multiplatform interop.

Author: hyochan

Sources/OpenIapModule+ObjC.swift

@@ -282,18 +282,18 @@ import StoreKit
 
     // MARK: - Event Listeners
 
-    @objc func addPurchaseUpdatedListener(_ callback: @escaping ([String: Any?]) -> Void) -> NSObject {
+    @objc func addPurchaseUpdatedListener(_ callback: @escaping (NSDictionary) -> Void) -> NSObject {
         let subscription = purchaseUpdatedListener { purchase in
             let dictionary = OpenIapSerialization.purchase(purchase)
-            callback(dictionary)
+            callback(dictionary as NSDictionary)
         }
         return subscription as! NSObject
     }
 
-    @objc func addPurchaseErrorListener(_ callback: @escaping ([String: Any?]) -> Void) -> NSObject {
+    @objc func addPurchaseErrorListener(_ callback: @escaping (NSDictionary) -> Void) -> NSObject {
         let subscription = purchaseErrorListener { error in
             let dictionary = OpenIapSerialization.encode(error)
-            callback(dictionary)
+            callback(dictionary as NSDictionary)
         }
         return subscription as! NSObject
     }