Changelog: Updates in Grafana 9.3.11

[grafanabot]

9.3.11 (2023-03-22)

Bug fixes

• Alerting: Update scheduler to receive rule updates only from database. #64662, @yuri-tceretian
• Chore: Update Grafana to use Alertmanager v0.25.1-0.20230308154952-78fedf89728b. #64784, @yuri-tceretian