Update NEWS.

Author: serhiy-storchaka

Misc/NEWS.d/next/Security/2025-06-18-13-34-55.gh-issue-135661.NZlpWf.rst

@@ -1,2 +1,5 @@
 Fix CDATA section parsing in :class:`html.parser.HTMLParser` according to
 the HTML5 standard: ``] ]>`` and ``]] >`` no longer end the CDATA section.
+Add private method ``_set_support_cdata()`` which can be used to specify
+how to parse ``<[CDATA[`` -- as a CDATA section in foreign content
+(SVG or MathML) or as a bogus comment in the HTML namespace.