update loxigen-artifacts
update loxigen-artifacts

* submodules/loxigen-artifacts 835e6c4...8619d52 (3):
  > Artifacts from https://github.com/floodlight/loxigen/compare/1dcdc363b51be6f0c8e02648bf5dbbc0b2b2708c...e9d105578e13db5fa6c52f0b8c7b4d80f328b31a
  > Artifacts from https://github.com/floodlight/loxigen/compare/201b2d72df2f8d39d9e87bebdf5e348772e26716...1dcdc363b51be6f0c8e02648bf5dbbc0b2b2708c
  > Artifacts from https://github.com/floodlight/loxigen/compare/d521400167a9a8e014afffed95952e3412f85007...201b2d72df2f8d39d9e87bebdf5e348772e26716

vezril/ivs,floodlight/ivs,vezril/ivs,floodlight/ivs,floodlight/ivs,vezril/ivs