cgi module is deprecated

[jamie-chang-globality]

See the following deprecation warnin

deboiler/models/lxml_node.py:1: DeprecationWarning: 'cgi' is deprecated and slated for removal in Python 3.13
    import cgi

cgi is only used once:

        text = cgi.html.unescape(text)  # type: ignore

This should be replaced with the html module and html.unescape