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.

---------

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

site/profiles/manifests/metrics/grafana.pp

@@ -1,6 +1,7 @@
 # profiles::metrics::grafana
 class profiles::metrics::grafana (
   String    $ldap_bind_pass,
+  String    $version        = 'installed',
   Stdlib::Port $http_port   = 8080,
   String    $app_mode       = 'production',
   Boolean   $allow_sign_up  = false,
@@ -107,6 +108,7 @@ class profiles::metrics::grafana (
 
   # deploy grafana
   class { 'grafana':
+    version  => $version,
     cfg      => $cfg,
     ldap_cfg => $ldap_cfg,
     plugins  => $plugins,