chore: update logInAppPurchase to use defaultTargetPlatform for iOS check

Author: SelaseKay

packages/firebase_analytics/firebase_analytics/lib/firebase_analytics.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:io';
-
 import 'package:firebase_analytics_platform_interface/firebase_analytics_platform_interface.dart';
 import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_core_platform_interface/firebase_core_platform_interface.dart'

packages/firebase_analytics/firebase_analytics/lib/src/firebase_analytics.dart

@@ -1223,7 +1223,7 @@ class FirebaseAnalytics extends FirebasePluginPlatform {
     bool? subscription,
     num? value,
   }) {
-    if (!Platform.isIOS) {
+    if (defaultTargetPlatform != TargetPlatform.iOS) {
       throw UnimplementedError('logInAppPurchase() is only supported on iOS.');
     }
     return _delegate.logEvent(