removed inexistent and unused import

Author: HugoMario

modules/swagger-codegen/src/main/resources/aspnetcore/3.0/Startup.mustache

@@ -14,7 +14,6 @@ using Newtonsoft.Json.Serialization;
 using Swashbuckle.AspNetCore.Swagger;
 using Swashbuckle.AspNetCore.SwaggerGen;
 using {{packageName}}.Filters;
-using {{packageName}}.Security;
 
 namespace {{packageName}}
 {

modules/swagger-codegen/src/main/resources/aspnetcore/3.0/controller.mustache

@@ -7,7 +7,6 @@ using Swashbuckle.AspNetCore.SwaggerGen;
 using Newtonsoft.Json;
 using System.ComponentModel.DataAnnotations;
 using {{packageName}}.Attributes;
-using {{packageName}}.Security;
 using Microsoft.AspNetCore.Authorization;
 using {{modelPackage}};