www/grafana: Revive and update to 10.2.3

What's new:

• https://grafana.com/docs/grafana/next/whatsnew/whats-new-in-v10-2/
• https://grafana.com/docs/grafana/next/whatsnew/whats-new-in-v10-1/
• https://grafana.com/docs/grafana/next/whatsnew/whats-new-in-v10-0/

Changelog:

• https://github.com/grafana/grafana/releases/tag/v10.2.3
• https://github.com/grafana/grafana/releases/tag/v10.2.2
• https://github.com/grafana/grafana/releases/tag/v10.2.1
• https://github.com/grafana/grafana/releases/tag/v10.2.0