is-email-address method incorrectly validates invalid email addresses

### Description

### Description
The **is-email-address** method in the **lib/@ stdlib /assert/** module is incorrectly returning true for invalid email addresses.

### Related Issues

When attempting to validate email addresses using the is-email-address method, we are encountering unexpected results. For example, when providing the following inputs:

@
@gmail.com
abc@gmail
abc@

The validation does not behave as expected.

### Questions

I would like to work on these issue!!

### Demo

_No response_

### Reproduction

```shell
- We need to modify the regular expression used for validating email addresses.
```

### Expected Results

```shell
false
false
false
false
```

### Actual Results

```shell
true
true
true
true
```

### Version

^0.6.0

### Environments

Node.js

### Browser Version

_No response_

### Node.js / npm Version

v22.11.0 / 10.9.0

### Platform

Windows 11

### Checklist

- [x] Read and understood the [Code of Conduct](https://github.com/stdlib-js/stdlib/blob/develop/CODE_OF_CONDUCT.md).
- [x] Searched for existing issues and pull requests.

The target is the is-email-address method in lib/@stdlib/assert/; start by locating its email-validation regular expression and checking the four examples in the issue. Done means all four inputs return false; verify the method with the module's existing checks after the change.

索引モデルが issue の本文から書いたものです。