fixed cide analizer warnings

lib/binding.dart

@@ -20,8 +20,8 @@ class Binding<T> {
   late Mode _mode;
   late Type _key;
   late String _name;
-  T? _instance = null;
-  T? Function()? _provider = null;
+  T? _instance;
+  T? Function()? _provider;
   late bool _isSingeltone = false;
   late bool _isNamed = false;
 

lib/di.dart

@@ -13,7 +13,7 @@
 
 import 'package:cherrypick/scope.dart';
 
-Scope? _rootScope = null;
+Scope? _rootScope;
 
 class CherryPick {
   /// RU: Метод открывает главный [Scope].
@@ -21,9 +21,7 @@ class CherryPick {
   ///
   /// return
   static Scope openRootScope() {
-    if (_rootScope == null) {
-      _rootScope = Scope(null);
-    }
+    _rootScope ??= Scope(null);
     return _rootScope!;
   }
 

lib/scope.dart

@@ -103,8 +103,8 @@ class Scope {
   T? tryResolve<T>({String? named}) {
     // 1 Поиск зависимости по всем модулям текущего скоупа
     if (_modulesList.isNotEmpty) {
-      for (Module module in _modulesList) {
-        for (Binding binding in module.bindingSet) {
+      for (var module in _modulesList) {
+        for (var binding in module.bindingSet) {
           if (binding.key == T &&
               ((!binding.isNamed && named == null) ||
                   (binding.isNamed && named == binding.name))) {