Update grafana-dashboard to the latest to support rails-app/registry etc.
We can update the latest version of grafana-dashboard including addition of rails-app/registry (grafana-dashboards!32 (merged) & grafana-dashboards!34 (merged)) and fixes/improvements (grafana-dashboards!28 (merged) & grafana-dashboards!41 (merged)).
Edited by Takuya Noguchi