www/grafana8: Update to 8.5.26

ChangeLog:
https://grafana.com/blog/2023/06/06/grafana-security-release-new-grafana-versions-with-security-fixes-for-cve-2023-2183-and-cve-2023-2801/

PR: 271893
Reported by: drtr0jan@yandex.ru
MFH: 2023Q2 (security fixes)
Security: CVE-2023-2183 CVE-2023-2801

(cherry picked from commit 5e1375eb67faca515b66fdfd599540c68dd321a8)