update Admin.NET/Admin.NET.Web.Entry/appsettings.json.

地址不可用，加载架构时出错

Signed-off-by: David <2535688890@qq.com>

Admin.NET/Admin.NET.Web.Entry/appsettings.json

@@ -1,5 +1,5 @@
 {
-    "$schema": "https://gitee.com/dotnetchina/Furion/raw/net6/schemas/v3/furion-schema.json",
+    "$schema": "https://gitee.com/dotnetchina/Furion/raw/v4/schemas/v4/furion-schema.json",
 
     "ConfigurationScanDirectories": [ "Configuration", "" ] // 扫描配置文件json文件夹（自动合并该文件夹里面所有json文件）
 }