Update Grafana

Update grafana, to use more recent golang. This also brings support of multi line logs in loki.

See merge request !921
3 jobs for feat/grafana-gomod in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:25:19

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:18:04

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:55:51