Update link to docker image
Update link to docker image

Since we moved the images to commercialhaskell/stackage, we need to update the link there
fpco/stackage,iand675/stackage,stackbuilders/stackage,clinty/stackage,soenkehahn/stackage,mrkkrp/stackage,spencerjanssen/stackage,mgajda/stackage,mstksg/stackage,Shimuuar/stackage,peti/stackage,Daniel-Diaz/stackage,michalkonecny/stackage,fimad/stackage,athanclark/stackage,asr/stackage,creichert/stackage,simonmichael/stackage,jonschoning/stackage,ethercrow/stackage,wereHamster/stackage,int-index/stackage,massysett/stackage