www/node: Update 11.14.0 -> 12.0.0

Update to the latest major release of Node.js, which includes many
significant changes. Users are encouraced to read the release
announcement before upgrading.

https://nodejs.org/en/blog/release/v12.0.0/

Update minimum version requirements for dependencies. Regenerate patches
with make makepatch.

Sponsored by: Miles AS