Update paas-accounts version
Update paas-accounts version

Updated version bumps the pinned go version from 1.9 to 1.11 as 1.9 is no
longer supported by the latest buildpack

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