Make tests compatible with curl 8.19.0

Make tests compatible with curl 8.19.0

In 8.19.0-rc2, the error logic has been changed so any later errors are
preserved. This changes what is returned by curl and therefore what tornado
sees. For HTTPError variant of the test, which uses CurlAsyncHTTPClient, we get
the error from pycurl and now it contains "Failed binding local connection
end". This logic handles both the old version of libcurl and also the newer
one.

Co-Authored-By: Samuel Henrique <samueloph@debian.org>