www/node: Update 15.5.0 -> 15.5.1

https://nodejs.org/en/blog/release/v15.5.1/

This is a security release. See
https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/

PR: 252681
MFH: 2021Q1
Security: 08b553ed-537a-11eb-be6e-0022489ad614
Sponsored by: Miles AS