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I have managed to override without modifying the original class.
To do this, I have create a CustomerLoginForm.php file in the directory in override/classes/form with the following code inside:
 

<?php

use Symfony\Component\Translation\TranslatorInterface;
use PrestaShop\PrestaShop\Adapter\ServiceLocator;

class CustomerLoginForm extends CustomerLoginFormCore
{
    public function submit()
    {    
    $context = Context::getContext();    
        if ($this->validate()) {
            Hook::exec('actionAuthenticationBefore');
            $oldkey = "8cBGziikjAX7NwLcGc9WsdDgR7O7nOxiK9KxvWLV9ZBcE6JjCiZZvEVz";
            $pass_old_type = md5($oldkey . $this->getValue('password'));
            
        try {
            /** @var \PrestaShop\PrestaShop\Core\Crypto\Hashing $crypto */
            $crypto = ServiceLocator::get('\\PrestaShop\\PrestaShop\\Core\\Crypto\\Hashing');
            } catch (CoreException $e) {
                return false;
                }
                $customer = new Customer();
                $my_customer_values = $customer->getByEmail($this->getValue('email'));
                $passwordHash = $my_customer_values->passwd;
                        
            if ($pass_old_type === $passwordHash) {
                
                 $customer->passwd = $crypto->hash($this->getValue('password'), _COOKIE_KEY_);
                 $ok =  Db::getInstance()->update('customer', array( 'passwd' => $customer->passwd), '`id_customer` = '.(int)$customer->id);
            }
            
            $customer = new Customer();
            $authentication = $customer->getByEmail(
               $this->getValue('email'),
               $this->getValue('password')
            );
                    
            if (isset($authentication->active) && !$authentication->active) {
                $this->errors[''][] = $this->translator->trans('Your account isn\'t available at this time, please contact us', [], 'Shop.Notifications.Error');
            } elseif (!$authentication || !$customer->id || $customer->is_guest) {
                $this->errors[''][] = $this->translator->trans('Authentication failed.', [], 'Shop.Notifications.Error');
            } else {
                $this->context->updateCustomer($customer);

                Hook::exec('actionAuthentication', ['customer' => $this->context->customer]);

                // Login information have changed, so we check if the cart rules still apply
                CartRule::autoRemoveFromCart($this->context);
                CartRule::autoAddToCart($this->context);
            }
        }

        return !$this->hasErrors();
    }

}

Before it didn't work for me because it didn't include this: use Symfony\Component\Translation\TranslatorInterface;

😁