feat: 修复兼容问题

Yi.Abp.Net8/framework/Yi.Framework.SqlSugarCore/SqlSugarDbContext.cs

@@ -163,7 +163,7 @@ namespace Yi.Framework.SqlSugarCore
                     if (entityInfo.PropertyName.Equals(nameof(IAuditedObject.CreationTime)))
                     {
                         //为空或者为默认最小值
-                        if (oldValue is null || DateTime.MinValue.Equals((DateTime)oldValue))
+                        if (oldValue is null || DateTime.MinValue.Equals(oldValue))
                         {
                             entityInfo.SetValue(DateTime.Now);
                         }