www/grafana: Update 11.6.0 => 11.6.1

Changelog:
https://github.com/grafana/grafana/releases/tag/v11.6.1

CVEs fixed:

• 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)

https://grafana.com/blog/2025/04/22/grafana-security-release-medium-and-high-severity-fixes-for-cve-2025-3260-cve-2025-2703-cve-2025-3454/

PR: 286323
Security: CVE-2025-2703
Security: CVE-2025-3260
Security: CVE-2025-3454
MFH: 2025Q2
(cherry picked from commit 090b96f085d03e6a7b88ad257e6daf1e5afc6019)