GAT: Grafana setup

Hi,
Just a bug report. Using
```
- src: cloudalchemy.grafana
version: 0.14.2
```
I got an error message when I upgraded grafana:
```
logger=settings t=2024-05-14T14:05:03.631161731+02:00 level=error msg="Option '[alerting].enabled' cannot be true. Legacy Alerting is removed. It is no longer deployed, enhanced, or supported. Delete '[alerting].enabled' and use '[unified_alerting].enabled' to enable Grafana Alerting. For more information, refer to the documentation on upgrading to Grafana Alerting (https://grafana.com/docs/grafana/v10.4/alerting/set-up/migrating-alerts)"
```
Then I realized the role is archived: https://github.com/cloudalchemy/ansible-grafana
The fix I am using now is to use in the group_vars/monitoring.yml:
```
grafana_alerting: {}
```
But maybe the GTN should use grafana.grafana.grafana role.

Sorry, no time to dig into this but this may be helpful to other admins.