fix: [stix2 import] Fixed Sighting import format
fix: [stix2 import] Fixed Sighting import format

MISP/MISP,SteveClement/MISP,FloatingGhost/MISP,FloatingGhost/MISP,MISP/MISP,devnull-/MISP,FIRSTdotorg/MISP,SteveClement/MISP,FloatingGhost/MISP,FloatingGhost/MISP,Rafiot/MISP,MISP/MISP,devnull-/MISP,Rafiot/MISP,SteveClement/MISP,devnull-/MISP,MISP/MISP,SteveClement/MISP,Rafiot/MISP,SteveClement/MISP,devnull-/MISP,FIRSTdotorg/MISP,MISP/MISP,FIRSTdotorg/MISP,FIRSTdotorg/MISP,Rafiot/MISP