Update build-constraints.yaml
Update build-constraints.yaml

GPipe 2.2.2 now supports GHC 8.2.1 and builds using latest stackage nightly
ethercrow/stackage,int-index/stackage,jonschoning/stackage,fimad/stackage,clinty/stackage,phaazon/stackage,iand675/stackage,mgajda/stackage,creichert/stackage,stackbuilders/stackage,peti/stackage,garetxe/stackage,soenkehahn/stackage,massysett/stackage,simonmichael/stackage,asr/stackage,fpco/stackage,michalkonecny/stackage,GregorySchwartz/stackage,wereHamster/stackage,athanclark/stackage,Shimuuar/stackage,spencerjanssen/stackage,k0ral/stackage,Daniel-Diaz/stackage,lwm/stackage,mstksg/stackage,mrkkrp/stackage