Escape sequences in links are not unescaped

[AndreasMadsen]

Marked version:
v11.1.1

Describe the bug
Hi, thanks for providing a great package.

It looks like escape sequences in links are not unescaped. Different Markdown renders treat this edge case slightly different. For example, GitHub does not unescape, but VS Code and CommonMark does unescape. As it's unusual to have a \ in a link, but common to have \., I think it will be safe to always unescaped.

This is likely a duplicate of #829. But this was closed and moved to the consolidation issue #984, and then never fixed. Hence, I'm posting this with a clear test case.

Thanks again.

To Reproduce

import { marked } from 'marked';
import { equal } from 'node:assert/strict'

const escaped = "Link must have the format: https://youtu\\.be/\\_\\_"
const expected = '<p>Link must have the format: <a href="https://youtu.be/__">https://youtu.be/__</a></p>\n'

equal(marked.parse(escaped), expected);

1. Marked Demo
2. CommonMark Demo

Expected behavior

Actual output: Link must have the format: https://youtu\.be/\_\_
Expected output: Link must have the format: https://youtu.be/__.

[AndreasMadsen]

Oh, I now realize this happens because GitHub flavor is the default. Sorry for the noise.