Add node 4.8.6, remove node 4.8.5
Add node 4.8.6, remove node 4.8.5

source url: https://nodejs.org/dist/v4.8.6/node-v4.8.6.tar.gz
source sha256: f37a92ca7254ecac80f905a5ba5c5ccf8d886c7dab80d84cf6e28af24b1ff680

[#152648755]

cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack,cloudfoundry/ruby-buildpack