feat(TreeView): use Task instead of ValueTask (#4737)

* refactor(TreeView): use Task instead of ValueTask

* chore: bump version 9.0.2-beta03

Author: ArgoZhang

src/BootstrapBlazor/BootstrapBlazor.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk.Razor">
 
   <PropertyGroup>
-    <Version>9.0.2-beta02</Version>
+    <Version>9.0.2-beta03</Version>
   </PropertyGroup>
 
   <ItemGroup>

src/BootstrapBlazor/Components/TreeView/TreeView.razor.cs

@@ -433,7 +433,7 @@ public async ValueTask TriggerKeyDown(string key)
     /// <param name="items"></param>
     /// <returns></returns>
     [JSInvokable]
-    public ValueTask<List<CheckboxState>> GetParentsState(List<int> items)
+    public Task<List<CheckboxState>> GetParentsState(List<int> items)
     {
         var rows = Rows;
         var result = items.Select(i =>
@@ -447,7 +447,7 @@ public ValueTask<List<CheckboxState>> GetParentsState(List<int> items)
             item.CheckedState = checkedState;
             return checkedState;
         }).ToList();
-        return ValueTask.FromResult(result);
+        return Task.FromResult(result);
     }
 
     private static bool IsExpand(TreeViewItem<TItem> item) => item.IsExpand && item.Items.Count > 0;