bump testflight
bump testflight

Submodule src/github.com/concourse/testflight 6071f6c..c6ac3d6:
  > squash resource_type tests into one example

Signed-off-by: Evan Short <5b1db704470d35a058f1f4a9e1a5a172a6ea69d3@pivotal.io>

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