www/node: Update 13.7.0 -> 13.8.0

https://nodejs.org/en/blog/release/v13.8.0/

This is a security release. See
https://nodejs.org/en/blog/vulnerability/february-2020-security-releases/

MFH: 2020Q1
Security: 0032400f-624f-11ea-b495-000d3ab229d6
Sponsored by: Miles AS