refactor: update close method to return Promise<Void> in iOS and Android implementations

Author: patrickkabwe

ios/HybridNitroInAppBrowser.swift

@@ -16,7 +16,7 @@ class HybridNitroInAppBrowser: HybridNitroInAppBrowserSpec {
             throw RuntimeError.error(withMessage: "Invalid URL")
         }
 
-        return Promise.async {
+        return .async {
             return try await withCheckedThrowingContinuation { continuation in
                 DispatchQueue.main.async { [weak self] in
                     do {
@@ -30,9 +30,11 @@ class HybridNitroInAppBrowser: HybridNitroInAppBrowserSpec {
         }
     }
 
-    func close() {
-        DispatchQueue.main.async { [weak self] in
-            self?.browserPresenter.dismiss()
+    func close() throws -> Promise<Void> {
+        return .async {
+            DispatchQueue.main.async { [weak self] in
+                self?.browserPresenter.dismiss()
+            }
         }
     }
 }

nitrogen/generated/android/c++/JHybridNitroInAppBrowserSpec.cpp

@@ -3,5 +3,5 @@ import type { NitroInAppBrowserOptions } from '../types';
 export interface NitroInAppBrowser
     extends HybridObject<{ ios: 'swift'; android: 'kotlin' }> {
     open(url: string, options?: NitroInAppBrowserOptions): Promise<void>
-    close(): void
+    close(): Promise<void>
 }