test: speed up parallel/test-tls-session-cache

This test had some unnecessary timeouts that made it run for a
much longer time than necessary (about 9 s rather than 0.2 s).

PR-URL: https://github.com/nodejs/node/pull/18424


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>