code clean up

Author: damienbod

aspnetcore/security/authentication/configure-oidc-web-authentication/sample/oidc-net8/RazorPageOidc/Program.cs

@@ -1,10 +1,8 @@
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Microsoft.AspNetCore.Authentication.OpenIdConnect;
 using Microsoft.AspNetCore.Authorization;
-using Microsoft.AspNetCore.Mvc.Authorization;
 using Microsoft.IdentityModel.JsonWebTokens;
 using Microsoft.IdentityModel.Protocols.OpenIdConnect;
-using Microsoft.IdentityModel.Tokens;
 var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddAuthentication(options =>