deps: update llhttp to 6.0.2

Fix: #37053
See: https://github.com/nodejs/llparse/pull/44
PR-URL: https://github.com/nodejs/node/pull/38665


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Daniele Belardi <dwon.dnl@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>