Pin pool resource to 1.1.1
Pin pool resource to 1.1.1

In concourse 6.3 the bundled pool resource was updated to 1.1.2 which is
broken for our use-case (unintentionally)

See:
https://github.com/concourse/pool-resource/issues/54
https://github.com/concourse/pool-resource/issues/55

Pin to 1.1.1 fixes the issue

Signed-off-by: Toby Lorne <527052641d65eef236eeef9545b2acac74c35d57@digital.cabinet-office.gov.uk>

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf