deps,http: http_parser set max header size to 8KB

CVE-2018-12121

PR-URL: https://github.com/nodejs-private/node-private/pull/143
Ref: https://github.com/nodejs-private/security/issues/139
Ref: https://github.com/nodejs-private/http-parser-private/pull/2


Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Anna Henningsen <anna@addaleax.net>