www/grafana: Update 12.3.3 => 12.4.0

Release Notes:
https://grafana.com/blog/grafana-12-4-release-all-the-latest-features/

What's new:
https://grafana.com/docs/grafana/latest/whatsnew/whats-new-in-v12-4/

Changelogs:
https://github.com/grafana/grafana/releases/tag/v12.3.4
https://github.com/grafana/grafana/releases/tag/v12.4.0

PR: 293564