www/node14: copy from www/node, update 14.14.0 -> 14.15.0 (LTS)
Create a new port for the latest Node.js 14.15.0 LTS release. Update
CONFLICTS for the existing Node.js ports to include the new node14 port
and remove non-existent ports.
https://nodejs.org/en/blog/release/v14.15.0/
Sponsored by: Miles AS