Do not use heroku semver endpoint for npm
Do not use heroku semver endpoint for npm

- We do not want to curl the semver heroku endpoint to resolve
  a version of npm to install as those results can change on the fly.
  Rather, we'd prefer to just rely on using the npm version installed with
  whichever node version was installed.

[#136345251]

Signed-off-by: Keaty <ba27100af1ae477f2abedd28f15b1dd208b1f48a@pivotal.io>

kauffecup/nodejs-buildpack,ks2software/nodejs-buildpack,pkumar-appd/nodejs-buildpack,ks2software/nodejs-buildpack,cloudfoundry/nodejs-buildpack,pkumar-appd/nodejs-buildpack,oocl-ncc-itm/nodejs-buildpack,cloudfoundry/nodejs-buildpack,ks2software/nodejs-buildpack,ks2software/nodejs-buildpack,oocl-ncc-itm/nodejs-buildpack,ks2software/nodejs-buildpack,ks2software/nodejs-buildpack,kauffecup/nodejs-buildpack,kauffecup/nodejs-buildpack,pkumar-appd/nodejs-buildpack,cloudfoundry/nodejs-buildpack,ks2software/nodejs-buildpack,cloudfoundry/nodejs-buildpack,oocl-ncc-itm/nodejs-buildpack