bump baggageclaim
bump baggageclaim

concourse/concourse#2165

Submodule src/github.com/concourse/baggageclaim b7b274e3..6638a80e:
  > Add debug server

Signed-off-by: Shash Reddy <1b59e0d2ac1ccc006e81da671242cb1775d373a2@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse