Bug: Entity::toRawArray() may return Time object

### PHP Version

8.1

### CodeIgniter4 Version

4.4.3 and develop

### CodeIgniter4 Installation Method

Git

### Which operating systems have you tested for this bug?

macOS

### Which server did you use?

cli-server (PHP built-in webserver)

### Database

MySQL 8.0.34

### What happened?

The following code returns Time object.

```php
$user->updated_at = '2023-12-12 12:12:12';
var_dump($user->toRawArray());
```

### Steps to Reproduce

```
+----+------------+--------------------+---------+--------------------+--------------------+------------+
| id | name | email | country | created_at | updated_at | deleted_at |
+----+------------+--------------------+---------+--------------------+--------------------+------------+
| 1 | John Smith | john@example.co... | US | 2023-12-07 04:0... | 2023-12-07 04:0... | |
+----+------------+--------------------+---------+--------------------+--------------------+------------+
```
```php
find(1);
var_dump($user->toRawArray());

$user->updated_at = '2023-12-12 12:12:12';
var_dump($user->toRawArray());

$user = $users->find(1);
var_dump($user->toRawArray());
}
```

```
/Users/kenji/work/codeigniter/official/CodeIgniter4/app/Controllers/Home.php:15:
array (size=7)
'id' => string '1' (length=1)
'name' => string 'John Smith' (length=10)
'email' => string 'john@example.com' (length=16)
'country' => string 'US' (length=2)
'created_at' => string '2023-12-07 04:00:48' (length=19)
'updated_at' => string '2023-12-07 04:00:48' (length=19)
'deleted_at' => null

/Users/kenji/work/codeigniter/official/CodeIgniter4/app/Controllers/Home.php:18:
array (size=7)
'id' => string '1' (length=1)
'name' => string 'John Smith' (length=10)
'email' => string 'john@example.com' (length=16)
'country' => string 'US' (length=2)
'created_at' => string '2023-12-07 04:00:48' (length=19)
'updated_at' =>
object(CodeIgniter\I18n\Time)[88]
protected 'timezone' =>
object(DateTimeZone)[90]
public 'timezone_type' => int 3
public 'timezone' => string 'UTC' (length=3)
protected 'locale' => string 'en' (length=2)
protected 'toStringFormat' => string 'yyyy-MM-dd HH:mm:ss' (length=19)
public 'date' => string '2023-12-12 12:12:12.000000' (length=26)
public 'timezone_type' => int 3
public 'timezone' => string 'UTC' (length=3)
'deleted_at' => null

/Users/kenji/work/codeigniter/official/CodeIgniter4/app/Controllers/Home.php:21:
array (size=7)
'id' => string '1' (length=1)
'name' => string 'John Smith' (length=10)
'email' => string 'john@example.com' (length=16)
'country' => string 'US' (length=2)
'created_at' => string '2023-12-07 04:00:48' (length=19)
'updated_at' => string '2023-12-07 04:00:48' (length=19)
'deleted_at' => null
```

### Expected Output

Returns string value `'2023-12-12 12:12:12'`?

### Anything else?

_No response_

Bắt đầu bằng cách theo dõi Entity::toRawArray() với entity User và các trường ngày được hiển thị trong phần tái hiện. Chạy lại chuỗi find, phép gán và toRawArray đã cung cấp, sau đó xác minh rằng updated_at được trả về dưới dạng string như mong đợi thay vì một đối tượng CodeIgniter\I18n\Time.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.