fix: [stix2 export] Fixed pattern of protocol value in network socket object creation
fix: [stix2 export] Fixed pattern of protocol value in network socket object creation

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