fix(ios): fix getViewController under UIScene + bump Flutter min SDK

- getViewController: replaced deprecated UIApplication.delegate.window
  (returns nil under UIScene) with UIWindowScene lookup on iOS 13+,
  falling back to the AppDelegate window for older iOS versions.

- pubspec.yaml: bumped Flutter minimum SDK from >=1.10.0 to >=3.38.0
  as required by the Flutter plugin migration guide for adopting
  FlutterSceneLifeCycleDelegate.

Addresses review comments on PR #438.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Kobikg78

ios/Classes/AppsflyerSdkPlugin.m

@@ -906,9 +906,20 @@ - (void)appDidBecomeActive {
 
 
 + (FlutterViewController*) getViewController{
-    UIViewController *topMostViewControllerObj =  [[[UIApplication sharedApplication] delegate] window].rootViewController;
+    UIWindow *window = nil;
+    if (@available(iOS 13.0, *)) {
+        for (UIWindowScene *scene in [UIApplication sharedApplication].connectedScenes) {
+            if (scene.activationState == UISceneActivationStateForegroundActive) {
+                window = scene.windows.firstObject;
+                break;
+            }
+        }
+    }
+    if (window == nil) {
+        window = [[[UIApplication sharedApplication] delegate] window];
+    }
+    UIViewController *topMostViewControllerObj = window.rootViewController;
     FlutterViewController *flutterViewController = (FlutterViewController *)topMostViewControllerObj;
-    
     return flutterViewController;
 }
 

pubspec.yaml

@@ -6,7 +6,7 @@ homepage: https://github.com/AppsFlyerSDK/flutter_appsflyer_sdk
 
 environment:
   sdk: '>=2.17.0 <4.0.0'
-  flutter: ">=1.10.0"
+  flutter: ">=3.38.0"
 
 dependencies:
   flutter: