Newer tlds not supported

### Description

The current e-mail regular expression cannot catch the latest (and greatest?) TLDs. There are many these days:

https://en.wikipedia.org/wiki/List_of_Internet_top-level_domains

but scancode limits it to something either 2, 3 or 4 characters:

```
def emails_regex():
return re.compile('\\b[A-Z0-9._%-]+@[A-Z0-9.-]+\\.[A-Z]{2,4}\\b', re.IGNORECASE)
```