fix CWEs example

Author: Calle Kabo

schema/bom-1.4.schema.json

@@ -1488,7 +1488,7 @@
           "type": "array",
           "title": "CWEs",
           "description": "List of Common Weaknesses Enumerations (CWEs) codes that describes this vulnerability. For example 399 (of https://cwe.mitre.org/data/definitions/399.html)",
-          "examples": ["399"],
+          "examples": [399],
           "additionalItems": false,
           "items": {
             "$ref": "#/definitions/cwe"