Re-enable graphviz since it has been fixed
Re-enable graphviz since it has been fixed

Cc: 67a80855b5086ff6006c7e90cf43ec4762e60ebd@ncaq

iand675/stackage,int-index/stackage,jonschoning/stackage,spencerjanssen/stackage,soenkehahn/stackage,fimad/stackage,asr/stackage,stackbuilders/stackage,mrkkrp/stackage,Daniel-Diaz/stackage,massysett/stackage,wereHamster/stackage,simonmichael/stackage,ethercrow/stackage,mstksg/stackage,michalkonecny/stackage,athanclark/stackage,peti/stackage,clinty/stackage,fpco/stackage