Increase DTFx.Core and DTFx.AS versions to 2.15.0 and 1.15.1 respectively#987

davidmrdavid merged 2 commits intomainAzure/durabletask:mainfrom

dajusto/rev-dtfx-core-azstorageAzure/durabletask:dajusto/rev-dtfx-core-azstorageCopy head branch name to clipboard