Bump iconv to support ruby 2.6
Bump iconv to support ruby 2.6

ualbertalib/avalon,ualbertalib/avalon,nulib/avalon,nulib/avalon,avalonmediasystem/avalon,uvalib/avalon,nulib/avalon,uvalib/avalon,uvalib/avalon,ualbertalib/avalon,uvalib/avalon,avalonmediasystem/avalon,ualbertalib/avalon,avalonmediasystem/avalon,avalonmediasystem/avalon,nulib/avalon