www/grafana: Update 12.0.2 => 12.1.0 (Fixes high vulnerabilities)

• CVE-2025-6023 - XSS via client path traversal and open redirect
• CVE-2025-6197 - Open redirect via organization switching

https://grafana.com/blog/2025/07/17/grafana-security-release-medium-and-high-severity-fixes-for-cve-2025-6197-and-cve-2025-6023/

Release notes:
https://grafana.com/blog/2025/07/28/grafana-12.1-release-all-the-latest-features/
What's new:
https://grafana.com/docs/grafana/next/whatsnew/whats-new-in-v12-1/
Changelog:
https://github.com/grafana/grafana/releases/tag/v12.1.0

PR: 288533
Security: CVE-2025-6023
Security: CVE-2025-6197
MFH: 2025Q3