test: deflake test-http-dump-req-when-res-ends.js

On some platforms the `'end'` event might not be emitted because the
socket could be destroyed by the other peer while the client is still
sending the data triggering an error. Use the `'close'` event instead.

PR-URL: https://github.com/nodejs/node/pull/30360


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>