fix: [stix1 import] Fixed uuids parsing
fix: [stix1 import] Fixed uuids parsing

- Using the built-in uuid parsing method to avoid
  potential issues when some uuids are provided
  without dashes, instead of getting is as a
  string, which fails when there is no dash

SteveClement/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP,MISP/MISP,SteveClement/MISP,SteveClement/MISP,MISP/MISP,MISP/MISP