移除 `Microsoft.AspNetCore.Mvc.NewtonsoftJson` 拓展包（无需安装）

Signed-off-by: 百小僧 <monksoul@outlook.com>

Admin.NET/Admin.NET.Core/Admin.NET.Core.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
@@ -30,7 +30,6 @@
     <PackageReference Include="Magicodes.IE.Excel" Version="2.7.5.1" />
     <PackageReference Include="Magicodes.IE.Pdf" Version="2.7.5.1" />
     <PackageReference Include="MailKit" Version="4.4.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="6.0.29" />
     <PackageReference Include="Microsoft.AspNetCore.SignalR.Protocols.NewtonsoftJson" Version="6.0.29" />
     <PackageReference Include="Microsoft.AspNetCore.SignalR.StackExchangeRedis" Version="6.0.29" />
     <PackageReference Include="NEST" Version="7.17.5" />