www/node8: Update 8.11.2 -> 8.11.3

Update to the latest security release, fixing CVE-2018-7161,
CVE-2018-7167, and CVE-2018-1000168.

https://nodejs.org/en/blog/release/v8.11.3/
https://nodejs.org/en/blog/vulnerability/june-2018-security-releases/

PR: 229038
Submitted by: Pascal Christen <pascal.christen@hostpoint.ch>
MFH: 2018Q2
Security: 45b8e2eb-7056-11e8-8fab-63ca6e0e13a2
Sponsored by: Miles AS