Fixed ref type

Signed-off-by: Steve Springett <steve@springett.us>

Author: stevespringett

schema/bom-1.5.schema.json

@@ -1590,7 +1590,7 @@
           "type": "array",
           "uniqueItems": true,
           "items": {
-            "type": "string"
+            "$ref": "#/definitions/refType"
           },
           "title": "BOM references",
           "description": "The bom-ref identifiers of the components or services being described. Assemblies refer to nested relationships whereby a constituent part may include other constituent parts. References do not cascade to child parts. References are explicit for the specified constituent part only."