SECURITY UPDATE: unhandled NotImplementedError denial-of-service in the
html.parser module when parsing malformed markup declarations
debian/patches/CVE-2025-69534.patch: narrow the marked-section dispatch
in parse_html_declaration() in Lib/html/parser.py so only "<![CDATA["
is routed to parse_marked_section(); any other malformed "<!..."
construct now falls through to parse_bogus_comment() instead of
reaching ParserBase.error(), which raises NotImplementedError.