Update CITATION.cff

add empty orcid fields for those who don't have one

Author: koudyk

CITATION.cff

@@ -15,6 +15,7 @@ authors:
   orcid: "https://orcid.org/0000-0002-4429-8481"
 - family-names: "Chen"
   given-names: "Alice"
+  orcid: ""
 - family-names: "Gau"
   given-names: "Rémi"
   orcid: "https://orcid.org/0000-0002-1535-9767"
@@ -29,6 +30,7 @@ authors:
   orcid: "https://orcid.org/0000-0002-3432-6899"
 - family-names: "Mirhakimi"
   given-names: "Niusha"
+  orcid: ""
 - family-names: "Poline"
   given-names: "Jean-Baptiste"
   orcid: "https://orcid.org/0000-0002-9794-749X