Goldmark TOC is unescaped leading to invalid HTML output

[lukpank]

What version of Hugo are you using (hugo version)?

$ hugo version
Hugo Static Site Generator v0.63.1/extended linux/amd64 BuildDate: unknown

Does this issue reproduce with the latest release?

Yes

Invaild TOC HTML for goldmark

TOC entries are not properly escaped leading to invalid HTML for "goldmark" Markdown parser.

For the following Markdown heading

## A < B & C > D

the output TOC entry has the (not properly escaped) form

<li><a href="#a--b--c--d">A < B & C > D</a></li>

while the heading is properly escaped

<h2 id="a--b--c--d">A &lt; B &amp; C &gt; D</h2> 

For "blackFriday" markdown parser both TOC entry and the heading are
properly escaped.

[github-actions]

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