Added missing CVSSv4 documentation

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

Author: stevespringett

schema/bom-1.5.schema.json

@@ -1487,7 +1487,7 @@
     "scoreMethod": {
       "type": "string",
       "title": "Method",
-      "description": "Specifies the severity or risk scoring methodology or standard used.\n\n* CVSSv2 - [Common Vulnerability Scoring System v2](https://www.first.org/cvss/v2/)\n* CVSSv3 - [Common Vulnerability Scoring System v3](https://www.first.org/cvss/v3-0/)\n* CVSSv31 - [Common Vulnerability Scoring System v3.1](https://www.first.org/cvss/v3-1/)\n* OWASP - [OWASP Risk Rating Methodology](https://owasp.org/www-community/OWASP_Risk_Rating_Methodology)",
+      "description": "Specifies the severity or risk scoring methodology or standard used.\n\n* CVSSv2 - [Common Vulnerability Scoring System v2](https://www.first.org/cvss/v2/)\n* CVSSv3 - [Common Vulnerability Scoring System v3](https://www.first.org/cvss/v3-0/)\n* CVSSv31 - [Common Vulnerability Scoring System v3.1](https://www.first.org/cvss/v3-1/)\n* CVSSv4 - [Common Vulnerability Scoring System v4](https://www.first.org/cvss/v4-0/)\n* OWASP - [OWASP Risk Rating Methodology](https://owasp.org/www-community/OWASP_Risk_Rating_Methodology)",
       "enum": [
         "CVSSv2",
         "CVSSv3",