13.7.0 allows invalid URLs that are missing the port number

[kaiyoma]

Describe the bug
In 13.6.0, the string http://foo.com: would cause isURL to fail, which seems correct to me, since the port number is missing. However, in 13.7.0, this string passes validation. This seems wrong.

Examples
isURL('http://foo.com:')

Additional context
Validator.js version: 13.7.0
Node.js version: 14.15.0
OS platform: Windows 10, Linux

[tux-tn]

Probably introduced in #1833

[tux-tn]

After some research, actually this has been introduced in #1751, You can follow the discussion there to understand the reasons of the change (And no it's not a bug)
Thank you