enable hledger/-lib/-api with support for #2666
enable hledger/-lib/-api with support for #2666

These packages now support megaparsec 6 and should be free of other dep issues.
garetxe/stackage,spencerjanssen/stackage,mrkkrp/stackage,clinty/stackage,creichert/stackage,jonschoning/stackage,soenkehahn/stackage,massysett/stackage,k0ral/stackage,Shimuuar/stackage,ethercrow/stackage,lwm/stackage,asr/stackage,peti/stackage,iand675/stackage,int-index/stackage,simonmichael/stackage,Daniel-Diaz/stackage,athanclark/stackage,stackbuilders/stackage,fimad/stackage,mgajda/stackage,mstksg/stackage,GregorySchwartz/stackage,michalkonecny/stackage,phaazon/stackage,fpco/stackage,wereHamster/stackage