security/vuxml: Add grafana vulnerabilities
- CVE-2025-2703 - DOM XSS vulnerability (Medium)
- CVE-2025-3260 - Bypass Viewer and Editor permission (High)
- CVE-2025-3454 - Authorization bypass in data source proxy API (Medium)
PR: 286323
Reported by: Boris Korzun <drtr0jan@yandex.ru