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Somehow with newer libxml2, `<?xml encoding="UTF-8">` no longer enforces
UTF-8. Instead, non-ASCII contents are treated as ISO-8859-1 and get
broken.
For example, `<p>中文</p>` becomes
`<p>中文</p>` (should be
`<p>中文</p>`).
Switching to another trick mentioned on [1] fixes the issue, and the
new trick still works with older libxml2 (tested 2.11.5).
As a side note, DOMDocument::loadHTML uses HTMLParser in libxml2 [2][3].
[1] https://stackoverflow.com/questions/8218230/php-domdocument-loadhtml-not-encoding-utf-8-correctly
[2] https://github.com/php/php-src/blob/php-8.1.26/ext/dom/document.c#L1855
[3] https://gnome.pages.gitlab.gnome.org/libxml2/devhelp/libxml2-HTMLparser.html
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