GraphQL BACKWARD_COMPAT flag fix (#1157)
GraphQL BACKWARD_COMPAT flag fix (#1157)

It assumed the defaults would pull in silverstripe/graphql:3,
but due to the loosened constraints ("3 || 4") it pulls in silverstripe/graphql:4.
silverstripe/silverstripe-admin,silverstripe/silverstripe-admin,silverstripe/silverstripe-admin