RE-1280 Update rpc-artifacts submodule
RE-1280 Update rpc-artifacts submodule

cloudnull/rpc-openstack,robb-romans/rpc-openstack,rcbops/rpc-openstack,BjoernT/rpc-openstack,jacobwagner/rpc-openstack,hughsaunders/rpc-openstack,robb-romans/rpc-openstack,cloudnull/rpc-openstack,rcbops/rpc-openstack,hughsaunders/rpc-openstack,BjoernT/rpc-openstack,jacobwagner/rpc-openstack