upgrade pulumni grafana provider

[n1ru4l]

move to https://github.com/pulumiverse/pulumi-grafana instead of using outdated @lbrlabs/pulumi-grafana

[dotansimha]

move to pulumiverse/pulumi-grafana instead of using outdated @lbrlabs/pulumi-grafana

Just flagging that last time that I tried to upgrade, something in the auth didn't work. it might just need a quick adjustment to the configuration.

Upgrading would be helpful, we'll be able to share the Grafana alerts as JSONs/TS