deps: update to http-parser 2.6.2

Fixes http-parser regression with IS_HEADER_CHAR check
Add test case for obstext characters (> 0x80) is header

PR-URL: https://github.com/nodejs/node/pull/5237


Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>