:mod:`http.client` now limits the number of chunked-response trailer lines
it will read to :attr:`~http.client.HTTPConnection.max_response_headers`
(100 by default), and the number of interim (1xx) responses it will skip
to 100.  A malicious or broken server could previously stream trailer
lines or ``100 Continue`` responses forever, hanging the client even when
a socket timeout was in use.
Reported by ``@YLChen-007`` via GHSA-w4q2-g22w-6fr4.
