www/node: Update 11.2.0 -> 11.3.0

This is a security release that addresses multiple vulnerabilities. Users
are recommended to upgrade as soon as possible.

https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/
https://nodejs.org/en/blog/release/v11.3.0/

MFH: 2018Q4
Security: 2a86f45a-fc3c-11e8-a414-00155d006b02
Sponsored by: Miles AS