Remove nodejs buildpack from buildpacks (#14364)

.buildpacks

@@ -1,4 +1,3 @@
 https://github.com/heroku/heroku-buildpack-apt
 https://github.com/Scalingo/ffmpeg-buildpack
-https://github.com/Scalingo/nodejs-buildpack
 https://github.com/Scalingo/ruby-buildpack