Version bump to 1.21.3
Version bump to 1.21.3

dbalders/Ghost,Kikobeats/Ghost,kevinansfield/Ghost,TryGhost/Ghost,Gargol/Ghost,kevinansfield/Ghost,acburdine/Ghost,Kikobeats/Ghost,dbalders/Ghost,acburdine/Ghost,dbalders/Ghost,JohnONolan/Ghost,ErisDS/Ghost,bitjson/Ghost,ErisDS/Ghost,bitjson/Ghost,Kikobeats/Ghost,JohnONolan/Ghost,JohnONolan/Ghost,e10/Ghost,ErisDS/Ghost,TryGhost/Ghost,chevex/undoctrinate,kevinansfield/Ghost,TryGhost/Ghost,Gargol/Ghost,e10/Ghost,acburdine/Ghost,janvt/Ghost,janvt/Ghost