PHP Laravel：用auth的attempt方法來做認證時，如何加入軟刪除(deleted_at)條件

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\Auth;
use Illuminate\Http\Request;

class LoginController extends Controller
{
    /**
     * 嘗試處理認證
     *
     * @param Request
     * @return Response
     */
    public function authenticate(Request $request)
    {
        $credentials = $request->validate([
            'email' => ['required', 'email'],
            'password' => ['required']
        ]);
        if (Auth::attempt($credentials) {
            // 如果認證通過...
            return redirect()->intended('dashboard');
        }
        return back()->withErrors([
            'email' => ['認證資料不匹配']
        ])
    }
}

if (Auth::attempt([
    'email' => $email,
    'password' => $password,
    'deleted_at' => null,
]))