bump atc
bump atc

Submodule src/github.com/concourse/atc 4f12652..695467e:
  > simplify build view routes

concourse/concourse,cjcjameson/concourse,concourse/concourse,cjcjameson/concourse,concourse/concourse,cjcjameson/concourse,concourse/concourse,concourse/concourse