feat: upgrade grafana from default to 13.0.2 (#470)

Pin grafana package version to 13.0.2 via a new version parameter on
profiles::metrics::grafana, wired through to the puppet-grafana class.

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Co-authored-by: Ben Vincent <ben@unkin.net>
Reviewed-on: #470

hieradata/roles/infra/metrics/grafana.yaml

@@ -11,6 +11,7 @@ profiles::metrics::grafana::db_name: "%{hiera('profiles::sql::postgresdb::dbname
 profiles::metrics::grafana::db_user: "%{hiera('profiles::sql::postgresdb::dbuser')}"
 profiles::metrics::grafana::db_pass: "%{hiera('profiles::sql::postgresdb::dbpass')}"
 profiles::metrics::grafana::pgsql_backend: true
+profiles::metrics::grafana::version: '13.0.2'
 profiles::metrics::grafana::plugins:
   victoriametrics-logs-datasource:
     ensure: present