V4.6.4 fixes (#904)

* Check if context is still mounted or not before showing popup

* - Refactor Restore route flow
- Fix Monero.com restore from QR
- Remove deprecated restore classes
- Update Monero.com app version and notes

* Update Macos version and release notes

* Fixate android plugin versions as Flutter published new fail packages version

* Revert desktop changes as it's not supported yet to scan QR code on Desktop [skip ci]

* Revert macos version update [skip ci]

lib/utils/show_pop_up.dart

@@ -1,20 +1,23 @@
 import 'package:flutter/material.dart';
 
-Future<T?> showPopUp<T>({
-  required BuildContext context,
-  required WidgetBuilder builder,
-  bool barrierDismissible = true,
-  Color? barrierColor,
-  bool useSafeArea = false,
-  bool useRootNavigator = true,
-  RouteSettings? routeSettings
-}) {
-  return showDialog<T>(
-      context: context,
-      builder: builder,
-      barrierDismissible: barrierDismissible,
-      barrierColor: barrierColor,
-      useSafeArea: useSafeArea,
-      useRootNavigator: useRootNavigator,
-      routeSettings: routeSettings);
+Future<T?> showPopUp<T>(
+    {required BuildContext context,
+    required WidgetBuilder builder,
+    bool barrierDismissible = true,
+    Color? barrierColor,
+    bool useSafeArea = false,
+    bool useRootNavigator = true,
+    RouteSettings? routeSettings}) async {
+  if (context.mounted) {
+    return showDialog<T>(
+        context: context,
+        builder: builder,
+        barrierDismissible: barrierDismissible,
+        barrierColor: barrierColor,
+        useSafeArea: useSafeArea,
+        useRootNavigator: useRootNavigator,
+        routeSettings: routeSettings);
+  }
+
+  return null;
 }