Upgrade node to 8.11.2

This should contain npm version 6 which supports "npm ci".

Bug: skia:
Change-Id: I631dba2b6aca7794ec6ef960a256f275e4dfd04f
Reviewed-on: https://skia-review.googlesource.com/130240
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
2 files changed