tests: Fixed test172 cookie expiry

The test contains a cookie jar file where one of the cookies has an
expiry date of 1391252187 -- Sat, 1 Feb 2014 10:56:27 GMT which has
now expired. Updated to Wed, 14 Oct 2037 16:36:33 GMT as per test
179.

Reported-by: Adam Sampson
Bug: http://curl.haxx.se/bug/view.cgi?id=1330